Pawn game breaking bug

I was just in a game and this bug happened: Move 16 and 17. They were able to take my pawn as if it moved 1 space ahead, but I moved it 2.

That is not a bug, that is a valid move in chess called en passant: en.wikipedia.org/wiki/En_passant

These kinds of topics are so innocently cute :)

I hope you stick with chess! There's much to learn