Razer Ripsaw HD Streamlab OBS Problems

So I have my Razer Ripsaw HD setup, and it's video is working perfectly fine, and streaming it is great. The only problem I have is that it's not capturing my gaming PCs audio on the stream. I know how to turn the gaming PCs audio on in Streamlabs OBS, but every time I do, it lags the video capture on my OBS preview, and in stream/recordings. I figured it had to do with the temperature of my Ripsaw, but it does it when it's cooled off too, so I have no idea what to do. I've searched around the internet for over 2 hours, but I can't find anything to help.