We have had so many issues with Maps, I've lost count how many times I've asked for help.
On this portfolio, one of many: hidden link
The map works when you click on the link VIEW MAP lower down the page.
In Toolset Setting the API kep is inserted and not showing an error.
Yet in the backend on every portfolio Address Area is showing it could not connect.
This makes it trick, as it used to work, and we could drag the marker exactly where we wanted on a little preview screen.
Also when we inspect the site, it shows errors with the API and map.
Again, mystified why this isn't working when what we can see is working.
We will either need Login details (possibly to a staging site) or a copy of the site.
I could not see any error on the front end itself but as you say there it works.
I suspect some simple issue with maybe another API being registered or even a temporary hiccup with Google Itself (that service is down more times than I would like).
However, to be sure and to resolve this for you, I'd need either of above (if it's confirmed that this issue happens as well without other plugins or theme, the better).
We usually prefer staging sites, because - you know how it is - on live sites you do not want to make any tests or dangerous changes.
If you could provide us with something like this I think we can spot and resolve the issue in no time.
I activated the private replies fo this purpose.
Thank you!
PS I am not assigning this ticket to me, because my shift is almost over, however Shane will be around soon to help you in case, and tomorrow I am back as well, where I could pick up if required where we left.
PS2 I know you shared login with us before, but those get removed when the tickets are resolved for safety reasons.