Hi @moshe1111
The CSS is in wp-content/plugins/cool-tag-cloud/inc/cool-tag-cloud.css
In your case since a caching plugin is used the files are not loaded directly.
The caching plugin combines all CSS files (added by the theme and all plugins) into a single file which is located in a location like wp-content/cache/min/1/0136f1c953d8a1839947c45c32968312.css
It periodically recreates the file (uses a different random name) like that and switches to it.
The output of each page is separately cached as well, so some pages might use an old combined CSS file and some could use a new one.
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Can you send over the URL to a page where the issue happens, seeing the source code and which files it loads might give me an idea as to what’s going on.
The URL you originally sent works fine. This is what I see: https://i.imgur.com/S6rSLto.png