Strange strings in the html output

Since the last update the html output of the shortcode has some strange strings in it which destroys the whole website:

<div class=”bfd-single-download” id=”bfd-single-download-7447″>
array(14) {
[“bfd-default-css”]=>
string(1) “1”
[“bfd-background-colour-picker”]=>
string(7) “#041111”
[“bfd-font-colour-picker”]=>
string(7) “#ffffff”
[“bfd-hover-colour-picker”]=>
string(7) “#25aaac”
[“bfd-file-icon-colour-picker”]=>
string(7) “#ffffff”
[“bfd-file-size-display”]=>
string(1) “1”
[“bfd-force-new-tab”]=>
string(1) “1”
[“bfd_type_textfield”]=>
string(0) “”
[“bfd_size_textfield”]=>
string(0) “”
[“bfd_published_textfield”]=>
string(0) “”
[“bfd_download_textfield”]=>
string(0) “”
[“bfd_downloaded_textfield”]=>
string(0) “”
[“bfd_time_textfield”]=>
string(0) “”
[“bfd_times_textfield”]=>
string(0) “”
}

What is that?