Did you make sure you set 2 audio tracks? 1 for your speaker (game audio), 1 for your mic. If you did, both audios are recorded but they are in separate tracks. If you use VLC to view your video, right click the screen, go Audio, Audio Track, and you will find both tracks there.
Either extract them by right clicking your .avi file and extract audio or use a video editing software to separate the tracks.
This is so that users can clean-up their voice before encoding them into smaller sized files for upload.
