Just sent an email to White Labs - we'll see what they say.
I calibrate all of my instrumentation against NIST traceable references at regular intervals, and you're right; what I saw is indicative of a warmer-than-expected fermentation, but the instruments aren't lying, far as I can tell. I'll have a look-see tonight when I get home - the keg is sitting in there now, lagering. says it's at 32, we'll see.
Yeah, I know the center of mass in my fermenter can go 6 to 8 F higher than the outside of the glass carboy (where I take my readings) during an active fermentation, and I've always been a fan of cooler fermentations to keep things on the "clean" side, even if it takes a little longer. I also insulate the thermocouple so it is influenced only by the glass and not the ambient air in the fermeezer. So far I've not have any issues with fermentation, always comes out clean. This one's weird, though.