I won 3 games and lost one, out of those three games I lost 1 CSR. I got first place in every match even the one I lost. I first gained around 6 CSR, then I lost 1 CSR then gained 1 CSR then even when getting around 25 kills and 10 assists I gained 1 CSR.
Eventually, I won the last game I played and gain no CSR even though I had gotten first place again.
The matchmaking is also really really poor as I went on a team with a plat 3 and an onyx with 1750 even though I’m 1550.
Just lost 10 CSR after losing a game and only gained 5 after winning hard.
Update: I found out I lost 10 CSR because the game thought I left midgame even though I left at the end screen where it shows your stats.