Mobile sub menu doesn’t work

Hi,

I got a problem with the display of the sub menu. When i click on a Top level menu item, the sub menu opens slightly, but doesn’t show the sub menu items. I tried finding the solution in the forum, but couldn’t find it. My website is unfortunately only in my own domain, so here are some screenshots of the case.

The grey box is the only part shown (this is a screenshot on desktop in inspection mode):
https://drive.google.com/file/d/1-Yr_mKqSsCStbZVNvTh7bRigyLG8m1Oz/view?usp=sharing

Wordpress details:
https://drive.google.com/file/d/1MGQrTLCnJ3zFNySJw-ygM11OfM4rOlCO/view?usp=sharing
https://drive.google.com/file/d/13qXOeiTazO0ZuzqeKOEX7iz0l_2odEQh/view?usp=sharing
https://drive.google.com/file/d/1SeDCRG4-NE1bHqMqEpE9TQFWy6Jp702G/view?usp=sharing

Thanks a lot in advance ??

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