When I go to a category page on my Magento installation since a couple of weeks I do not have a working search/mobile menu/language switcher:
https://www.thefixedgearshop.com/beat-the-heat-sale
When trying to switch the language in a category it adds a # and doesn't open the JavaScript that is needed. When on Homepage/CMS page/Product page everything works great.
I cannot figure out where the bug is taking place. The Console doesn't tell me enough.