I’ll bet it’s not your MkV. I’ve been beating my head against the wall trying to program an expression pedal to a patch and the behavior is pretty much like you describe. No matter how many times I have tried it keeps picking some random range. Sometimes I’m done setting the range and without my hands touching a single thing I can sit and watch it jumping around on the H9 Control screen. THis just is not working and I’m getting pretty sick and tired of wasting time.