I think this bug is surely related to the erratic behaviour of radio buttons.
If I set up a toggle button to be a super and set the control to send the on value only then in the case that the midi range of this super is 0 to 127 everything is OK. If the range is non zero for both sides and despite the fact that super is supposed to send the on value only to the sub, actually both values are send to the sub. e.g values 1 to 127 will move the sub in both the open and the closed stated of the button.
I don't know if this has always been the the behaviour of toggles but it definetaly isn't right. I've got too many problems when I try to use radio buttons and manipulate other controls in series.