Not sure how it's with JEM 2.x but noticed with JEM 3.0.7 that there is a problem with loading Google map. It needs an Api-key. Guess the problem is with JEM 2.x too? Am currently not running JEM2.x so not sure, just wanted to point out that there seems to be a problem.
Google Maps Platform rejected your request. You must use an API key to authenticate each request to Google Maps Platform APIs. For additional information, please refer to
JEM2.x is the active development path, JEM3.x is not supported (obsolete)