So this is a very strange problem. Sometimes, pretty rarely whenever I am actively using my mic I can hear myself in the speakers repeat what I've said a couple of seconds ago. I've been trying for a long time to figure out what was the cause of that. I even ended up reinstalling Windows/sound drivers in hopes to fix it but it still happens sometimes. It only happens on my newer PC and never happened on the old one. Could it because of a faulty onboard audio?
EDIT: It happened in TS3, Skype and Discord. I used 3 different headsets during the last year - Corsair VOID, Corsair VOID wireless and now I'm using Logitech G933 and it still happens. Like I said I am pretty lost here since it happens in all kinds of programs and with all kinds of headsets. I was thinking it might be my onboard Realtek 1150 soundcard but USB headsets such as mine don't even use it as they have their own sound processing built-in