Language menu disappears

I have rebuilt a wix website and wanted to make it a multi-language one. Everything is working fine, but as soon as I open the website on any other computer/device, the language menu disappears. I first thought it was because I had it placed in the header too far to the side. But even if I place it in the middle of the website, it keeps disappearing.

What can/must I do to fix this? Or where lies the problem?

It looks like your issue is not related to coding. Please contact Wix Support at https://www.wix.com/contact/en for further assistance