Why Am I A Bronze?

ı was silver 1 at season 5's end. later ı played 10 placement matches it was 5/5 and ı become Bronze 1. how can ı be bronze 1? ı played 2 times gold V series on December. Really how can ı be bronze? {{sticker:zombie-brand-mindblown}} Note: sorry for bad grammer. Edit: my elo was normal for silver 1 ı was look it on euw.op.gg on December.
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