Issue(s) with Google Maps & General Menu Formatting

Hi,
I have the problem that when I want to view a profile, then Google Maps is not working, I am getting an error message:

Oops! Something went wrong. This page didn't load Google Maps correctly. See the JavaScript console for technical details. (I didnt look this up, as I dont understand JS).

Also, the main menu is not showing correctly according to my assigned Joomla template.

Google Maps API key is set.

Please see attached screenshot.

Thanks