Same wonder graphic appears twice

Suleiman builds the great library, I have a scout near Istanbul the turn of completion. I see the wonder graphic, everything is fine. A few turns later, I see two great libraries under construction graphics in Istanbul.

Reloaded, back to one great library.

Just happened again, with the Aztecs this time. Bought an embassy for city state quest, there are 2 statues of Zeus in Tenochtitlan.