Ranked it's working right?

I have this problem since the weekend I was qualifying in 2vs2 was onyx 3 with 92.8% to go up to diamond but when we won it did not go up if I had fewer deaths than my partner or my score was lower and still being as MVP did not rise but if I lost I went down now I have 76.05 could you give me an explanation of how to raise my ranks because I see that winning or high score is not enough?

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