Third/last language not working in menu

Hi there,

I have DE, EN and ES as language on my website

https://juvitalis.com

Whatever language is the third one in the main menu header, is not working, e.g. when hoovering over with the cursor, there is no link. It is not the language. When I change the order of the flags, the first and second always work, the third one does not.

Menus are definded the right way
All pages are connected to a language
Language switcher with showing flag in all menus

Any ideas?

The page I need help with: [log in to see the link]