4 Decks Panning and Not Giving Stereo Recording in Playback

I am using DJay Pro for the mac, latest version as I just downloaded it last week. I’m working with 4 decks but notice when I’m mixing and using the split output cable from Griffin, I’m getting stereo playback in the headphones. But, when I’ve recorded the mix and am playing it back through iTunes, the system appears to be panning my output.

I’m trying to pre-cue my tracks/records but am hearing this in the playback, and when I move the fader completely to one side it takes the playing deck and puts it to one headphone. Not sure what I’m missing here; but I’d really like to use the 4 decks and get stereo output. I see a setting that say THRU; but I"m not sure what this does.