Reply to Rane 64 and cdj 850 help!?

Hey guys I'm running into this issue with my new rane 64 and hope someone here may be able to help me resolve it. Basically I'm moving from a rane 62 and scratch live setup and this is my first time using serato dj outside the clubs I play at. What's happening is when using the cdjs in relative or absolute mode when I hit the play or cue button the song will jump back about half a beat and then start playing. I have a vide of it on youtube here it's done with an iPhone so the quality isn't great but you can see what's happening. Any feedback at all would be great as I can't find anythjng about this anywhere.