Hello, @Marcel,
I have tested the toggle widgets functionality on your site and it is working perfectly fine, and all the categories and brands are showing properly, please watch this video I have captured for you: https://www.veed.io/view/6f3cddbf-7bd0-411b-ad20-615ef3dd4b1d?sharingWidget=true
So it seems to be the cache issue only at your end nothing else, please try to clear all the cache and check back.
Regards 8Themes Team.
