Checkmate With Queen and King

Why isn't this a checkmate? I'm playing black. If the white king

Checkmate HD Wallpaper Chess queen, Chess king, Chess

I finally did the king and queen checkmate! : r/AnarchyChess

Chess Dama y rey contra rey King Checkmate Queen, chess

The White Queen Checkmate To Black King Stock Image - Image of

The King & Queen Coloring Book: Checkmate (Paperback)

Chess, game, strategy, winner, checkmate, queen, gambit icon

New rule: If your opponent is a woman or a girl, you'll have to checkmate her queen instead of her king in order to win. : r/AnarchyChess

In this position, (black to move) Qe1 is apparently checkmate, but I am confused because the rook is pinned and therefore cannot defend the queen. Can someone explain this to me?

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