Ranked flex bugged?

Hello, I've completed my provisional games for "Ranked flex" (Yes that bad matchmaking queue) I won 7 out of the 10 games required and I got bronze 5?! I was duo with a gold 5 (Hoping to be vs them for more MMR) And he got silver 3 why I got bronze 5? It's my first time in ranked and I don't feel I should be B5 For winning 7 out of 10 games If I wanted b5 I would've gone afk or just trolled
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