Can someone please explain how ranked matchmaking works

I have a 54% winrate in platinum 2, yet i get matched with gold 2 and 3 players who have negative winrates. How is this possible? You can check my latest amumu game if you don't believe me. Riot's matchmaking is truly weird so can someone explain why this is happening in soloq

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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