DDJ-400 + DJAY PRO problem with CUE

Hey!

Got a DDJ-400 controller and DJAY PRO 2 playing on a Macbook Pro. It's connected from the controller (from the MASTER output) to my speaker. My headphones is connected straight in to the controller. 

Both the "Main output" and the "Pre-cueing" is connected to DDJ-400 Audio Out in preferences.

My problem is that I keep hearing the song I'm playing in my headphones even though the CUE-button isn't pressed. When I'm pressing the CUE-button on the other song to hear what I'm about to play next, I hear both the songs in the headphones. One song in each ear. I want to be able to just hear the song in my headphones on the deck I've pressed the CUE-button and now the other one. 

I've been playing on with this setup before (with a friends controller on his computer) so I know it use to work. 

Thanks in advance!