I noticed your error notes were octaves of your true notes; this always the case?
yesterday I just left it running, I’ll see if I can reproduce later with this new knowledge.
btw, I’m not sufficiently knowledgeable to know whether this is appropriate, but it won’t harm to re-flash the firmware…
(you can always do Device → Export Everything… first, although I think the process described does that automatically)
Oh, and welcome to Midihub forums!