Which game on your profile was it?
my opponent made an illegal move

Actually, being able to move pieces after a live chess game is over is normal. You can make all sorts of illegal move, it's like with a real chess board at a club: when you're not in a game, you're free to play Ke1xe8.
However, an illegal move in game is indeed a bug-I hope support sees this.
Ok, see my opponent, just after we began playing, aborted the game but i couldn't work out why. I noticed that my queen had been moved to the "taken pieces" section even tho we'd only played 2 moves- then looking at the board, i saw that hs pawn was in my queen's spot- but just as a pawn- it hadn't been promoted. Also, u know how in a live game after the game is over u cant make anymore moves (obviously)? Well i could- i could move my pieces anywhere (but not my opponents). I'm just a bit confused and was wondering if anyone had an idea what was going on.