Can’t change language on mobile

Hello! For some time now, the plugin is not allowing us to pick a different language on mobile.

Translations work regularly on desktop, but not on mobile nor when the viewport is reduced on a computer browser.

Right now the menu is shown in the secondary menu.

Language switching works if we set a floating language selector, which unfortunately doesn’t quite match the website and looks kind of broken, even if it works regularly.

Any clues on why this is happening?

Thanks in advance!

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