ipad RMX1000 out of sync

I have the RMX1000 app on my ipad connected to my DJM450 and it just doesn't sync the BPM up at all. I've tried using auto detect but anytime you try to play something from the x-pad it's way out of time.

Trying to use the tap for BPM, works for a second or two and then is out as well - should this not be able to pick up on the BPM And stay in sync? As it is, it's un-usable.