From Gold to Bronze in 7/10 promo?

Quick question i was Gold V last season (was gold 3 but stopped playing for a while), finally started playing game again, win 7 out of 10 games in placement which i thought was decent, end up in bronze... is this normal? did i do something wrong? not even upset since i'll stop playing this in a couple of weeks, just want to know if this is a bug or something also obligatory: GOD DAMN RITO Y U DO DIS????
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