I looked at the read-only link page your shared. Saw one Google map which was not configured. Please share a published URL that shows the issue. Maybe I can circle back and check.
To debug this I would try moving the map out of the Grid, republish and check. I would also check to see if a blank page with only a map produces the same artifacts.
So this appears to affect only your project since I can’t duplicate the issue on one of mine. You could further isolate by trying to create a new project with a map. If it persists that would indicate something related to your API project. If not, that would point to something specific to your WF project. I looked but did not see anything obvious.