That's you're issue. This is from the xposed thread :
"It is important to note that even in version 2.4 final, Xposed is not compatible with the new ART compiler. And at this time, it is unclear if it will ever be made compatible, as it would require a major rewrite if it is even possible at all. So in order to prevent boot loops, the Xposed framework automatically resets you to Dalvik if you accidentally enable ART. And if you do wish to try ART, you will first have to disable the framework entirely."
oke thanks, didn't know that.
Xposed before ART for me