Well, this is the reason that it is only possible to register one effect per line. Renoise can only record one Mx per line (within the panorama column).
Hey, what version do you have, 49, 61 or 88 keys? If it were 61 or 88 keys, I would ask you to confirm if my tool works perfectly. Unfortunately, I have only been able to test it with my 49-key Arturia Keylab Mkii.