Flex 3v3 queue - From Challenger to gold 2

I understand there is alot going on with the new queues but some things I cannot comprehend. I played all queues for seasons and were placed at master S5 and Challenger S6 in 3v3. Diamond soloq in both seasons. First I got to platinum 3, a bit higher than my other teammates and after the fix I gotta start playing as Gold 2? Most players only switched 1-2 tiers max and I have to settle dropping a whole league giving me the strong feeling that something went terribly wrong. Knowing this is only the pre-season, how much will this affect my place next season?
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