Halo CEA audio bug

Hello sadly I have a possible bug/glitch going on while im playing campaign.

So far all it is, is when I hear music some of the audio does not play.

For instance in the first mission when you hear the iconic halo song being played in the back ground I hear the song but it sounds as if some of it is missing. (as if I had my settings set to play thru 7.1 surround sound but im actually using stereo)

Anyone else encountered this problem and any known way to fix it?