Hello, I'm having this issue too!
Have you found a way to get back to normal? It has only happened in the past few days, before it was fine for my voice in the game.
My microphone has no problems, I have tried it in OBS, Discord and in the Audio settings "Listen to this device" everything is normal and fine.
It's just that my voice changed to slow mo and robot in the Valorant game.
I hope someone can help solve this problem