Suddenly go crazy with CSS?

Hello,

I am using this plugin for almost two years. Merge + Minify + Refresh is the best plugin for minification. Unfortunately, today suddenly go crazy with CSS, back to the top floating button, not showing the icon and many other icons on posts. I honestly do not why I didn’t update any plugins for almost three days or messing with the code. I have contacted hosting to see if they maybe they do something but no. Can you visit the site and look around, please?

If I check “Don’t Merge CSS,” all icons are back to normal, but this function is unchecked for two years!!

Thanks.

The page I need help with: [log in to see the link]