There isn't a time-delay across the two channels. Not a huge level difference across channels, either (min: .15 dB, max 1.41 dB, Avg RMS .62 dB, Tot RMS .63 dB). In checking out a quick frequency analysis, it does seem the R channel is significantly stronger, in some cases -much- stronger (6-12+ dB). Perhaps this is the cause of the off sound? I'm grasping, here, in over my head. At any rate, I definitely can hear what you're talking about, it does sound a bit off.
Any chance L = up, R = down? To my ears, R seems to have more, but less defined low end, a bit muddy, causing me to guess it's pointing down.