When Previewing the following code, everything looks correct. When I Render, I get completely different and unexpected results. Am I doing something wrong, or is this an openSCAD bug?

for (x = [0:1]) {
    for (y = [0:1]) {
        translate ([(x*50),0,(y*30)]) {
            difference () {
                cube ([55,35,35]);
                translate ([5,-0.01,5]) {
                    cube ([45,30,25]);
                }
            }
            difference () {
                translate ([27.5,15,7]) {
                    sphere (d=29, $fa=1);
                }
                translate ([0,0,-20]) {
                    cube ([55,35,20]);
                }
            }
        }
    }
}

OpenSCAD 2019.11.20
Ubuntu 18.04.3 LTS

OpenSCAD Version: 2019.11.20
System information: Linux 5.0.0-37-generic #40~18.04.1-Ubuntu SMP Thu Nov 14 12:06:39 UTC 2019 x86_64 Ubuntu Core 16 4 CPUs 7.69 GB RAM
User Agent: OpenSCAD/2019.11.20 (Linux x86_64; Ubuntu Core 16)
Compiler: GCC "5.4.0 20160609" 64bit
MinGW build: No
Debug build: No
Boost version: 1_58
Eigen version: 3.2.92
CGAL version, kernels: 4.14.1, Cartesian, Extended_cartesian, Epeck
OpenCSG version: OpenCSG 1.4.2
Qt version: 5.5.1
QScintilla version: 2.9.1
InputDrivers:
GLib version: 2.48.2
lodepng version: 20180910
libzip version: 1.0.1
fontconfig version: 2.11.94
freetype version: 2.6.1
harfbuzz version: 1.0.1
lib3mf version: (not enabled)
Application Path: /snap/openscad-nightly/1489/usr/bin
Documents Path: /home/speed/snap/openscad-nightly/1489/.local/share
User Documents Path: /home/speed/snap/openscad-nightly/1489
Resource Path: /snap/openscad-nightly/1489/usr/share/openscad-nightly
User Library Path: /home/speed/snap/openscad-nightly/1489/.local/share/OpenSCAD/libraries
User Config Path: /home/speed/snap/openscad-nightly/1489/.config/OpenSCAD
Backup Path: /home/speed/snap/openscad-nightly/1489/.local/share/OpenSCAD/backups
OPENSCADPATH:
OpenSCAD library path:
/home/speed/snap/openscad-nightly/1489/.local/share/OpenSCAD/libraries
/snap/openscad-nightly/1489/usr/share/openscad-nightly/libraries

OPENSCAD_FONT_PATH:
OpenSCAD font path:
/usr/share/fonts
/usr/local/share/fonts
/home/speed/snap/openscad-nightly/1489/.local/share/fonts
/home/speed/snap/openscad-nightly/1489/.fonts
/snap/openscad-nightly/1489/usr/share/fonts
/usr/X11/lib/X11/fonts
/System/Library/Fonts
/Library/Fonts
/home/speed/snap/openscad-nightly/1489/Library/Fonts
/usr/share/fonts/X11
/usr/share/fonts/cMap
/usr/share/fonts/cmap
/usr/share/fonts/eot
/usr/share/fonts/opentype
/usr/share/fonts/svg
/usr/share/fonts/truetype
/usr/share/fonts/type1
/usr/share/fonts/woff
/snap/openscad-nightly/1489/usr/share/fonts/truetype
/usr/share/fonts/X11/Type1
/usr/share/fonts/X11/encodings
/usr/share/fonts/X11/misc
/usr/share/fonts/X11/util
/usr/share/fonts/eot/font-awesome
/usr/share/fonts/opentype/font-awesome
/usr/share/fonts/opentype/malayalam
/usr/share/fonts/opentype/noto
/usr/share/fonts/svg/font-awesome
/usr/share/fonts/truetype/Gargi
/usr/share/fonts/truetype/Gubbi
/usr/share/fonts/truetype/Nakula
/usr/share/fonts/truetype/Navilu
/usr/share/fonts/truetype/Sahadeva
/usr/share/fonts/truetype/Sarai
/usr/share/fonts/truetype/abyssinica
/usr/share/fonts/truetype/ancient-scripts
/usr/share/fonts/truetype/dejavu
/usr/share/fonts/truetype/droid
/usr/share/fonts/truetype/font-awesome
/usr/share/fonts/truetype/fonts-beng-extra
/usr/share/fonts/truetype/fonts-deva-extra
/usr/share/fonts/truetype/fonts-gujr-extra
/usr/share/fonts/truetype/fonts-guru-extra
/usr/share/fonts/truetype/fonts-kalapi
/usr/share/fonts/truetype/fonts-orya-extra
/usr/share/fonts/truetype/fonts-telu-extra
/usr/share/fonts/truetype/freefont
/usr/share/fonts/truetype/kacst
/usr/share/fonts/truetype/kacst-one
/usr/share/fonts/truetype/lao
/usr/share/fonts/truetype/lato
/usr/share/fonts/truetype/liberation
/usr/share/fonts/truetype/lyx
/usr/share/fonts/truetype/malayalam
/usr/share/fonts/truetype/msttcorefonts
/usr/share/fonts/truetype/nanum
/usr/share/fonts/truetype/noto
/usr/share/fonts/truetype/open-sans
/usr/share/fonts/truetype/openoffice
/usr/share/fonts/truetype/padauk
/usr/share/fonts/truetype/pagul
/usr/share/fonts/truetype/samyak
/usr/share/fonts/truetype/samyak-fonts
/usr/share/fonts/truetype/sinhala
/usr/share/fonts/truetype/takao-gothic
/usr/share/fonts/truetype/tibetan-machine
/usr/share/fonts/truetype/tlwg
/usr/share/fonts/truetype/ttf-bitstream-vera
/usr/share/fonts/truetype/ttf-khmeros-core
/usr/share/fonts/truetype/ubuntu
/usr/share/fonts/type1/gsfonts
/usr/share/fonts/woff/font-awesome
/snap/openscad-nightly/1489/usr/share/fonts/truetype/dejavu
/snap/openscad-nightly/1489/usr/share/fonts/truetype/ubuntu-font-family
/usr/share/fonts/X11/encodings/large
GLEW version: 1.13.0
OpenGL Version: 3.0 Mesa 18.0.5
GL Renderer: Mesa DRI Intel(R) Haswell Mobile
GL Vendor: Intel Open Source Technology Center
RGBA(8880), depth(0), stencil(0)
GL_ARB_framebuffer_object: yes
GL_EXT_framebuffer_object: yes
GL_EXT_packed_depth_stencil: yes

Qt graphics widget: QOpenGLWidget
QSurfaceFormat: RGBA(8880), depth(0), stencil(0)

GL Extensions:
GL_3DFX_texture_compression_FXT1
GL_AMD_conservative_depth
GL_AMD_draw_buffers_blend
GL_AMD_seamless_cubemap_per_texture
GL_AMD_shader_trinary_minmax
GL_ANGLE_texture_compression_dxt3
GL_ANGLE_texture_compression_dxt5
GL_APPLE_object_purgeable
GL_APPLE_packed_pixels
GL_ARB_ES2_compatibility
GL_ARB_ES3_compatibility
GL_ARB_arrays_of_arrays
GL_ARB_blend_func_extended
GL_ARB_buffer_storage
GL_ARB_clear_buffer_object
GL_ARB_clear_texture
GL_ARB_clip_control
GL_ARB_color_buffer_float
GL_ARB_compressed_texture_pixel_storage
GL_ARB_compute_shader
GL_ARB_conditional_render_inverted
GL_ARB_conservative_depth
GL_ARB_copy_buffer
GL_ARB_copy_image
GL_ARB_cull_distance
GL_ARB_debug_output
GL_ARB_depth_buffer_float
GL_ARB_depth_clamp
GL_ARB_depth_texture
GL_ARB_derivative_control
GL_ARB_draw_buffers
GL_ARB_draw_buffers_blend
GL_ARB_draw_elements_base_vertex
GL_ARB_draw_instanced
GL_ARB_explicit_attrib_location
GL_ARB_explicit_uniform_location
GL_ARB_fragment_coord_conventions
GL_ARB_fragment_program
GL_ARB_fragment_program_shadow
GL_ARB_fragment_shader
GL_ARB_framebuffer_no_attachments
GL_ARB_framebuffer_object
GL_ARB_framebuffer_sRGB
GL_ARB_get_program_binary
GL_ARB_get_texture_sub_image
GL_ARB_half_float_pixel
GL_ARB_half_float_vertex
GL_ARB_instanced_arrays
GL_ARB_internalformat_query
GL_ARB_internalformat_query2
GL_ARB_invalidate_subdata
GL_ARB_map_buffer_alignment
GL_ARB_map_buffer_range
GL_ARB_multi_bind
GL_ARB_multisample
GL_ARB_multitexture
GL_ARB_occlusion_query
GL_ARB_occlusion_query2
GL_ARB_pipeline_statistics_query
GL_ARB_pixel_buffer_object
GL_ARB_point_parameters
GL_ARB_point_sprite
GL_ARB_polygon_offset_clamp
GL_ARB_program_interface_query
GL_ARB_provoking_vertex
GL_ARB_query_buffer_object
GL_ARB_robust_buffer_access_behavior
GL_ARB_robustness
GL_ARB_sample_shading
GL_ARB_sampler_objects
GL_ARB_seamless_cube_map
GL_ARB_seamless_cubemap_per_texture
GL_ARB_separate_shader_objects
GL_ARB_shader_atomic_counter_ops
GL_ARB_shader_atomic_counters
GL_ARB_shader_bit_encoding
GL_ARB_shader_clock
GL_ARB_shader_draw_parameters
GL_ARB_shader_group_vote
GL_ARB_shader_image_load_store
GL_ARB_shader_image_size
GL_ARB_shader_objects
GL_ARB_shader_precision
GL_ARB_shader_storage_buffer_object
GL_ARB_shader_texture_image_samples
GL_ARB_shader_texture_lod
GL_ARB_shading_language_100
GL_ARB_shading_language_420pack
GL_ARB_shading_language_packing
GL_ARB_shadow
GL_ARB_stencil_texturing
GL_ARB_sync
GL_ARB_texture_barrier
GL_ARB_texture_border_clamp
GL_ARB_texture_compression
GL_ARB_texture_compression_bptc
GL_ARB_texture_compression_rgtc
GL_ARB_texture_cube_map
GL_ARB_texture_cube_map_array
GL_ARB_texture_env_add
GL_ARB_texture_env_combine
GL_ARB_texture_env_crossbar
GL_ARB_texture_env_dot3
GL_ARB_texture_filter_anisotropic
GL_ARB_texture_float
GL_ARB_texture_gather
GL_ARB_texture_mirror_clamp_to_edge
GL_ARB_texture_mirrored_repeat
GL_ARB_texture_multisample
GL_ARB_texture_non_power_of_two
GL_ARB_texture_query_levels
GL_ARB_texture_query_lod
GL_ARB_texture_rectangle
GL_ARB_texture_rg
GL_ARB_texture_rgb10_a2ui
GL_ARB_texture_stencil8
GL_ARB_texture_storage
GL_ARB_texture_storage_multisample
GL_ARB_texture_swizzle
GL_ARB_texture_view
GL_ARB_timer_query
GL_ARB_transform_feedback2
GL_ARB_transform_feedback3
GL_ARB_transform_feedback_instanced
GL_ARB_transform_feedback_overflow_query
GL_ARB_transpose_matrix
GL_ARB_uniform_buffer_object
GL_ARB_vertex_array_bgra
GL_ARB_vertex_array_object
GL_ARB_vertex_attrib_binding
GL_ARB_vertex_buffer_object
GL_ARB_vertex_program
GL_ARB_vertex_shader
GL_ARB_vertex_type_10f_11f_11f_rev
GL_ARB_vertex_type_2_10_10_10_rev
GL_ARB_window_pos
GL_ATI_blend_equation_separate
GL_ATI_draw_buffers
GL_ATI_separate_stencil
GL_ATI_texture_env_combine3
GL_ATI_texture_float
GL_EXT_abgr
GL_EXT_bgra
GL_EXT_blend_color
GL_EXT_blend_equation_separate
GL_EXT_blend_func_separate
GL_EXT_blend_minmax
GL_EXT_blend_subtract
GL_EXT_compiled_vertex_array
GL_EXT_copy_texture
GL_EXT_draw_buffers2
GL_EXT_draw_instanced
GL_EXT_draw_range_elements
GL_EXT_fog_coord
GL_EXT_framebuffer_blit
GL_EXT_framebuffer_multisample
GL_EXT_framebuffer_multisample_blit_scaled
GL_EXT_framebuffer_object
GL_EXT_framebuffer_sRGB
GL_EXT_gpu_program_parameters
GL_EXT_multi_draw_arrays
GL_EXT_packed_depth_stencil
GL_EXT_packed_float
GL_EXT_packed_pixels
GL_EXT_pixel_buffer_object
GL_EXT_point_parameters
GL_EXT_polygon_offset
GL_EXT_polygon_offset_clamp
GL_EXT_provoking_vertex
GL_EXT_rescale_normal
GL_EXT_secondary_color
GL_EXT_separate_specular_color
GL_EXT_shader_integer_mix
GL_EXT_shader_samples_identical
GL_EXT_shadow_funcs
GL_EXT_stencil_two_side
GL_EXT_stencil_wrap
GL_EXT_subtexture
GL_EXT_texture
GL_EXT_texture3D
GL_EXT_texture_array
GL_EXT_texture_compression_dxt1
GL_EXT_texture_compression_rgtc
GL_EXT_texture_compression_s3tc
GL_EXT_texture_cube_map
GL_EXT_texture_edge_clamp
GL_EXT_texture_env_add
GL_EXT_texture_env_combine
GL_EXT_texture_env_dot3
GL_EXT_texture_filter_anisotropic
GL_EXT_texture_integer
GL_EXT_texture_lod_bias
GL_EXT_texture_object
GL_EXT_texture_rectangle
GL_EXT_texture_sRGB
GL_EXT_texture_sRGB_decode
GL_EXT_texture_shared_exponent
GL_EXT_texture_snorm
GL_EXT_texture_swizzle
GL_EXT_timer_query
GL_EXT_transform_feedback
GL_EXT_vertex_array
GL_EXT_vertex_array_bgra
GL_IBM_multimode_draw_arrays
GL_IBM_rasterpos_clip
GL_IBM_texture_mirrored_repeat
GL_INGR_blend_func_separate
GL_INTEL_performance_query
GL_KHR_blend_equation_advanced
GL_KHR_context_flush_control
GL_KHR_debug
GL_KHR_no_error
GL_KHR_robust_buffer_access_behavior
GL_KHR_robustness
GL_MESA_pack_invert
GL_MESA_shader_integer_functions
GL_MESA_texture_signed_rgba
GL_MESA_window_pos
GL_NV_blend_square
GL_NV_conditional_render
GL_NV_depth_clamp
GL_NV_light_max_exponent
GL_NV_packed_depth_stencil
GL_NV_primitive_restart
GL_NV_texgen_reflection
GL_NV_texture_barrier
GL_NV_texture_env_combine4
GL_NV_texture_rectangle
GL_OES_EGL_image
GL_OES_read_format
GL_S3_s3tc
GL_SGIS_generate_mipmap
GL_SGIS_texture_border_clamp
GL_SGIS_texture_edge_clamp
GL_SGIS_texture_lod
GL_SUN_multi_draw_arrays