WP boxer not showing images anymore

Hi. I need a help with wp boxer plugin. Recently I moved my wp web from cpanel shared hosting to cloud server. From now on wp boxer plugin does not loading images. I have problem with my 2d slider and portfolio plugin, too, but this is the question for wp boxer.

Here is the link to my web homepage:
https://www.mediared.co.rs/

Here is one of the pages with wp boxer plugin (no images loaded):
https://www.mediared.co.rs/?page_id=5511

Thanks, Uros

https://www.ads-software.com/plugins/boxer/