The OP states in his detail he is running Zorin 17.2
I suspect the issue is that you clearly have 3 different sources for audio to be processed. You need to decide which two need to be blacklisted. I would certainly blacklist HDMI source. What I suspect is you are having the software not knowing which hardware source to use.
Whilst my tutorial that I wrote was for a SoundBlaster AudigyRX card, you can decide which device you want to deal with sound and blacklist the two you don't need/want:
Also check out my last post on ensuring that you get sound out of each speaker: