Unfair placement matches.

Ok, I won 10 of 10 games in placement. Carried them all, last season I peaked at diamond 5 75lp and then was inactive due private life and dropped to plat 2, but still had an MMR for DIAMOND 5. After 10 wins in placement, I get dropped to PLAT 5??? Where is the logic in that? How much wins do you need to get to get at least the same division you were? 15/10?
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