Here's a guess... did you map two presses of the same key thinking you'd get twice the distance from each trim notch ("<,<" and "m,m")?
The double key may be confusing it as there is no "mm" button.
Somewhere in the controls for each button is a setting for single toggle, cycle, repeat with interval, etc. Look in there and only map the "," and "m" once.
Only x36 control I've ever bothered banding was the throttle in Falcon 4, so I'm sorry if that's not any more help to you.
Good luck.