Well, i HAD the same problem or pretty much something like that iiwith my shifter, i say had the problem , cuz iii was lucky enouiigh to be able to fix it,
what i encounter with my Shifter, was that in H-PAttern mode, all the slots on the impaired row (1 3 5) were all selecting same button 13, same with the 2,4,6 gear, all selected Button 12 , so i got some info, and figured out what the heck lets open that thing,
so i opened it , located both potentiometer and the wire harness, and with the info i had collected i could easily target which potentiometer was faulty ,
the 1 for lateral axis, luckly its the easiest to get to, without dissamsembling everything apart, my specific trouble was caused by a severed Black wire , its very small wire gauge, and if like me it was cut right at the edge of the plastic connector, your gonna have some fun making the repair , but its free to try if warranty is voided