possible glitch or cheating

It's called En Passant. Perfectly legal move.
https://support.chess.com/customer/en/portal/articles/1444779-my-opponent-made-an-illegal-move-
It's called En Passant. Perfectly legal move.
https://support.chess.com/customer/en/portal/articles/1444779-my-opponent-made-an-illegal-move-