If I started a thread every time my Brute made me raise an eyebrow, I'd have 20 threads.
Hell, my Brute's keybed started to make a brand new clacking noise today on the highest keys. No reason I can see.
Anyway: Having the detent in the pot not lining up with zero is a little weird though. I know you can calibrate the pitch/tracking but I'm not sure if there's any trimpots or adjustments for the envelope amount knobs.
Unless someone pipes up with a simple fix, I say live with it.