Question / Help Audio desync issues

Hey guys, recently I've started streaming as I finally got the internet connection I need for that. There's one huge problem I've encountered though; the audio lags behind the video. Here's the thing though: the microphone audio is fine. Absolutely no problems. The desktop audio however goes out of sync almost immediately, and appears to lag more and more behind the video the longer I stream for. This used to be an issue with my local recordings as well, but I thought it was an issue of me not checking the "Use Device Timestamps" tickbox in my desktop audio properties, but as it turns out that's not what's causing the issue. I'd really love to fix this somehow, as it's not letting me stream in the quality that I want.

Here's the twitch vod which is about an hour long where I noticed the issue: https://www.twitch.tv/videos/151581903

You don't have to watch the entire thing, just scroll to a random point in the video and you can clearly notice the audio delay. If you're not very familiar with Dota 2, just listen to the voice lines of the hero I'm playing and watch the hero portrait closely. You'll notice that the lines aren't at all synced with the lips moving, which they 100% should be.

Pastebin of the log: https://pastebin.com/N5Wz8ptj

Please help me with this, I've been looking around the web for a solution to this problem for a long time and I've yet to find one.
 
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