https://imgur.com/MTj7LfC
opponent had only king left, and i only lost 1 pawn, but game ended in draw

It is white's turn and there is no legal moves left for white and the king isn't in check, so yes, it is a stalemate.
https://support.chess.com/en/articles/8557490-what-is-stalemate
this has to be a bug. none of the stalemate requirements were met.