Didn't play ranked in s6 and decided to play this year

So just like the title says, I was silver in s5 and gold in s4, thats what I remember but yeah should be like that, so I finished my placements with 7-3, won 4 in a row and lost one then won two and etc you know the drill, and I won the last game and got placed in bronze 2, can someone just explain?
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