I feel your pain venam :(

PavuControl is such crap - it adds confusion for no good reason. Every time I change my audio setup in the slightest, it's bound to screw it up and I'll waste an afternoon fixing it. For instance, I recently bought a Schiit Fulla DAC, but when I plugged it in, no sound was sent through it. After opening pavucontrol, and fiddling around, I got it set up. However, when I went to play CS:GO, pavu decided that my mic should be the output of the DAC, so it just loopbacked (all because I forgot to set my mic as the default fallback).

I don't know how it can be fixed, but linux's audio system is crap right now. ALSA is usable for the most part, but most things require pulseaudio at this point, which inevitably means one will block the other somehow.