Submenu disappears on mobile too quickly

Hi!

When I want to click on the submenu items (of the main menu) on mobile, only the first click works and then the menu dissapears and doesn´t open again. I have to refresh the page and then I can click another item, but the menu disappears again quickly. The desktop version works fine.
Also the Social Media Symbols in the footer are not shown correctly anymore.
I think it has to do with an update?

Looking foreward to your response.

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