Can someone please explain the elo system?

I've been high silver/gold each season and went 7 wins 3 losses in my placements and landed bronze 1. I understand its supposed to drop you a bit but not almost 4 tiers lower. I don't get this kind of treatment in overwatch where I place the same skill rating each season because of skill. This game is getting less and less enjoyable because after 8 seasons the Elo system remains imbalanced. - Is a tad salty
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