More information, there are particular songs this issue is happening on, some songs will be mixed to but display the end of the song while it plays from begining, this only happens when using the mix function, if you normally chose and play these songs they play normally, the songs are wav files and dont appear to be different.
The other issue is some songs wont play when they are mixed to they get selected but dont play, even though the play button is active , when you hit stop and play still nothing, when you exit to another song it fixes itself.
It appears to be certain songs are disliked by the mix button.