I don't understand why I got placed so low?

Got placed in Bronze 3 was Silver 2 and checked my mmr on op.gg it says 1418 should be placed in Silver 1? Really annoying, I know riot done a soft reset or something and said expect to be placed lower then you when you finished but dropping 6 tiers while my mmr has been increasing is very difficult to understand :/. Currently earning 25 lp per win as well that seems a bit much doesn't it?
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