Why do I play with challengers in normal games

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In the past days I've played with rank 9 soloq challenger , a 3v3 challenger and laned vs a flex challenger(master soloq) Yasuo main. I'm plat 2 atm. You would think all players were between my rank and challenger, but no, a **silver tristana** was in the same game as the Yasuo. I feel like the matchmaking decides how all lanes goes, and not champion picks or if the person is playing better or worse than usual. The normal games are often decided before they even start with these insane elo differences. I want to play with people around my elo, diamond is fine but when a challenger player can 1v3 while building Ludens Echo on Yasuo there is nothing you can do.
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