Always hear them like this, what do you mean? One day the imbalance just appeared out of nowhere when I plugged them in my ears. Strange. It's not the cables either. Maybe one of the iem pin socket inside the earpiece failed.
Something gotta be wrong with it then lol. Did you always hear them like this? I don't find mine to be that way at all.... One thing I did notice which was strange... Was after using them for quite a while I cannot use an impedance adapter on it or it will cause an imbalance as you had said.