PopUps not working since latest ElementorPro Update

As working on the french version of this site, recently we discovered that none of the elementor popups are working anymore since latest update of elementor pro.

when deactivating polylang plugin, all is working fine. until some weeks ago, it did work also with polylang!?

to see it click on the first image after copy text or on the ‘Literatur’ button at the end.

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