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Hi there,
I think that is the effect of surround sound.
Is your smart enhancement on (audio option checked)?
You can find this setting in Video Enhancement option, Smart Enhancement tab.
If anybody needs more accurate tutorial, here you go:
1. Open Options (sprocket wheel image)
2. "Player Settings"
3. "Video, Audio, Subtitles"
4. "Videos:"
5. "Video Enhancements"
6. The "True Theather" window should pop up
7. Mark off the "Audio" check box
8. Done!