I here both of the songs even if the crossfader is to one side. The split output option is on and I have a split cable

I have connected my Split cable into my iPhone and I have turned on the Split output option and when I play the songs i can here both of them in the speaker. Even if the crossfader is completly to the other side (Djay 2)

In settings, slide the que slider to the left.

If you mean youre headphones.