Placement games MMR factor?

So i just finished my promo games, and they went very smooth. i queued solo for all of them and went 9-1. i was placed in silver 2. I was in gold 3 or so last season, with few games played, and surely my placement games should place me atleast in low gold? i dont play ranked much, usually just flex with my friends who are on low bronze level, so i have a flex mmr somewhere around mid silver i believe. would my flex mmr criple my placement mmr for solo/duo aswell? or is it just not possible to get placed at or above my last season rank at all? i prepared well for my games and was excited to see where i would end up, and this was honestly a huge dissapointment. Did any of you guys experience the same thing?
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