Converted WAV files play slow and low pitch

Converted from flac to wav and although the converted files play fine on my pc they are slowed down and low pitch when played back on my JAM. 

My guess is that .wav files take a lot more processing power to decode than what the Jam has available.

The package says it does that it does.  Some .wav files work fine tho

Check the sample rate,  44100 seems to be the only one that works