We currently have almost 600 pins on our map. All but one has pinned to the correct location without a problem.
This one, regardless of the address we attach to it, pins to a random location in Europe. When we go in and correct the address, a different pin will move over to take the place place of the corrected one so that a pin is, again, in Europe.
It's as if the app "wants to put a pin" in these two places.