In case if you can't open the game here is a screenshot.
How is this Checkmate???!!!

I do not understand. The queen can be captured by rook and my queen but still it is checkmate???
It's a double check so your rook can't take the queen since you're still in check by the queen on d7
https://www.chess.com/game/live/135514775547
I do not understand. The queen can be captured by rook and my queen but still it is checkmate???