[Geschlossen] Navigation menu not working

Background of the issue:
I am trying to navigate the menu on my website, but it doesn't work when I click on a category. The issue occurs on the page: versteckter Link. The menu only functions correctly in English.

Symptoms:
The menu redirects to the home page instead of the selected category when using languages other than English. The issue persists after deactivating and reactivating plugins, and it is linked to the WPML Multilingual CMS plugin.

Questions:
Why does the menu only work in English and not in other languages?
How can I fix the menu so it works in all languages?