I just got this message from WPML about the issue:

Hi,

The issue is also related to the theme Basel on your site. If I switch the theme to a default one of WordPress (2021), it works properly. It is more complex than I think, a compatibility issue between WPML, WP Global Cart plugins and Basel theme.

I’m discussing this issue with our 2nd tier support and update you here when I have something to share.

Thanks for your patience.