I thought that the error was only occurring on the front end.
But I’ve just gone in and checked and although it loads the map and seems to function the back end also has several errors.
Mostly failed to load resource 404 errors for the markers
/google-maps-builder/assets/img/default-icons/orange_markerG.png 404 (Not Found)
and
You have included the Google Maps API multiple times on this page. This may cause unexpected errors.