Gaining while losing

I gained 6 rating earlier after failed 6 and passed 5. So I should have lost some rating, but I gained 6 instead. How does the LiChess puzzle rating system work?

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White to checkmate in one move

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Help: lichess.org/0FxLYZvT
Checkmate

Black to checkmate in one move

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Click on the board to make your move, and prove you are human.

Help: lichess.org/LjHUEqu2/black
Checkmate