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It would help if you would give us some useful information etc. 
Did you try plugging your phones into a normal cd player etc? Can you rule out for sure that it is your mixer? I know that my DJM-600 has a mono/stereo switch that when it is on mono, I will only hear out of one ear. So if your heaphones were switched to mono and your heaphones to stereo, you would only hear out of one ear. Then, once you flipped your headphones to mono, you would hear out of both ears again. This wouldn't be a problem if your mixer wasn't on mono. If you switch it to stereo, then your headphones would play out of both ears whether it was on mono or stereo.
So is that it?
If not, are you using a 1/4" TRS to 1/8" TRS splitter jack? Some of the ones that I've tried (to let other people listen in to what I am while I dj) will not be in stereo and you'll hear sound only out of one ear.
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When you dance, the DJ takes you on a journey, but he or she is usually not the focus of your experience at a club or festival or wherever you hear the music. Dancing is. Music is.
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