CC Echoing while Streaming

Hey everybody!

I've been struggling with a weird echo while streaming from pretty much day one. I'm using CC for iRacing with OBS and it seams that every line is sent through my desktop audio device and my mic at the same time.

Adjusting the headset's analogue volume and the volume from within Windows does help a bit but it doesn't eliminate the echo completely.
At first I thought my mic was just capturing 'leaked' sounds from my headphones but it's clearly something else as it keeps echoing even when my headset volume is all the way down.

Should I capture CC's audio separately?
Thanks for your time.