I would try to ignore the files in these two directories:

wp-content/plugins/wp-review-slider-pro/public/js/

wp-content/plugins/wp-review-slider-pro/public/css/

Have you seen the issue in other cache plugins?

Great! Glad you found the problem.

The background color is what I used to set the ones in my screenshot to a black background.

I'm not seeing the CSS rules on the front end. Make sure to clear all cache plugins.

Does it look correct in the Preview?

Which template style? and which background exactly. A link to your site or a screenshot will help.

Post a link to your site please.

This is fixed in the Beta version 12.7.0. If you want to try it, just go to the Account page inside the plugin and check the "Join the Beta program" check box. Then the beta version should show up on the Updates page in WordPress. After you install the update. Deactivate and re-activate the plugin. That should force all the database table to update.

Sure, not a problem. I'll get it in the next update.

Can you give this a try now? I just tested it on two different servers and it seems to be working.