Audio playback problems when transferred - terrible quality.

I had to bring my project into uni to show the group but when I played the map it had absolutely terrible audio quality - very quiet and like it was being bit distorted. It worked and sounded fine at home. Is there a reason this could have happened?
I work on Mac but I opened the project on PC at uni.
Some of my audio is at a low sample rate but still all 16 bit WAVs.