Airplay not working properly

Im trying to use the Infuse app on my iphone. I try playing a movie and stream it using airplay. It doesnt work and starts playing the last song played on the Music App. If I delete all my music, it plays fine. Whats the deal with this?

 

also having problems using airplay in general, why is it that some movies force me to turn on Mirroring and others dont? 

 

edit: when using the app on my ipad mini, most of my movies play fine, but on some i’m still forced to enable Mirroring to get it work