The only anomaly I've seen is that my current reading of the BK(MT) is a degree higher than the output of the hex, which is odd!
Did you calibrate all of the sensors and enter any temp offsets into the PIDs?
Your might just have one sensor that is reading a little off.
My first probe had a static error of 3.5*F. The new one has a static error of 1.5*F. If I were to use those with out accounting for the errors, I would see temp differences 2.0*F between the two probes.