Don't start panicking please. It's a minor bug showing the player is in bronze age while he is actually already in classical age. Happens now and then. No big issue in my opinion. I did find 2 players out of the 10.000 I've scouted so far that had hacks going. One had 2 town halls and the other 200 walls or so. If you see things that are out of order in such a way best report them with a screenshot. They will take care of it.