Audio of clip changes pitch in timeline

Hi guys!

Any help greatly appreciated on this. I have a clip that keeps changing pitch to higher and making voices 20% squeakier when dragged into the timeline. I've tried changing the Audio Sample Rate, I've optimized the media, made it proxy, converted it from .mp4 to .mov. Tried nearly everything but it still seems to happen. I have a mixed media timeline with a number of different framerates etc among all the clips.

Anything I can convert it to that might stop this?