Entirely agree, I would have marked the second one as a duplicate, if I was reviewing it.
If they were separated by a greater distance, or each had unique architecture or something, I might think otherwise.
You can report one of them via the wayfarer map. Given that the one on the left isn’t in game, I would be tempted to do that one, unless I was also the person who submitted the duplicate. At that point I think it could be considered manipulating the gameboard.