There are several possibilities, one is that you are only sending your voice sound to your headset, and none of that sound is going to your capture device, in this case you need to configure the output in such that your capture device will receive voice chat too. I am assuming thats what you are looking for because of your mic offset.
If you're using a mix amp with your astros to get the sound to your PC then there are videos that can explain how to do it better than I can.