I set it to as slow as it could go so I could watch the game. It was weird because it got to a point where it declared a draw, but the pieces were still moving

I set it to as slow as it could go so I could watch the game. It was weird because it got to a point where it declared a draw, but the pieces were still moving around so I left it alone. Eventually a couple more pieces were captured and the non-optimized side managed to win, so it updated from "draw" to "checkmate".