It's a real time audio delay in headphones while started recording. Little bit delay ,You have to experience it to find the problem. Start playing pubg (Not only pubg every game) without screen recording and fire some shots using gun and notice the sound. Next start the screen recorder and fire some shots using gun, you can feel the delay. It's only a real time delay. No sound delay in recorded video (No problem) . Third party app doesn't have that kind of issue but third party app doesn't support the internal audio recording options. So its very important to fix it faster.
@Gustav_ASUS @Anders_ASUS