Track Quick Control problem


I hope someone out there can help.

I have successfully mapped the transpose quick controls to my MPK mini. The problem I am having is when I adjust the transpose parameter it moves in odd numbers 1,3,5,7,9 etc so I am only accessing half the notes available. I have tried my beatstep pro and have the same problem If I use the mouse there is not a problem. So does anyone know how I can access the full range of note when using the transpose quick control when it is mapped to an external midi controller?