Nope, it isn't my hearing, unless all of my other headphones were balanced the wrong way. Turning them around doesn't work so well either, since the drivers are angled something like 30 degrees towards the ears.
Anyway, the balance is perfectly centered now. Its a pity that I can't listen to it out of my main source, but they're excellent even out of inferior sources, like my laptop's headphone out (which isn't that bad, actually).