Problems on printing

I am having trouble printing using this plugin: text characters appear weird and wrong. Images remain intact. The error is happening on computers with windows 7 using Chrome. In some of these do not even appear the icon to print. Tested on Ubuntu with Firefox and it worked.

Can you help me?

Thanks for all.

https://wordpress.org/plugins/pdfjs-viewer-shortcode/