music overlapping issue so 2 music pieces play at the same time

[Zepondrax]

Ive played with no issues to date and in my 1st playthrough no issue but this play session for some reason it sounded like the music was playing over the top of another music playing,as it two copies of the game were running so it kind of ruined the atmosphere.
havent had that before, weird? anyone else have this happen?