Someone Explain this sudden drop in MMR please

I literally went from winning 23/24 and losing 15/ 16 to winning 22/20 and losing 18 , then literally 2 games later , one where I was a 25/2 khazix , I won 18 lp ??? Does being in Bronze means you're doomed to stay there or some shit ? XD
Best New

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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