So I don't know how this will help, but:
I noticed that the player is playing the music fast. This is from the fact that the seconds displayed on the screen ticking away rapidly. There may be a correlation from the speed of the music to its pitch. I think it's inducing a "chipmunk-rewind" effect, like when you rewind a tape recorder albeit at a much slower pace.
I tried several other flash drives with mp3, and still the problem persists.
Could the problem lie with the flash drives? Is there a preferred format of storage, say fat32 to media player?
Or could it be the mp3 format itself, like is there a way to make it play at a normal tempo on the media player?