Numark N4 Cue Mix Knob Does Not Work

I am reaching out for some help. Using the Numark N4 controller the Cue/Master mix knob does not seem to be working properly... It appears from the mapping pdf document on this site that it should be mapped (13) and that the Cue Volume knob (14) is mapped as "nothing / hardware" and should not work. However, the Cue Volume knob (14) does work and appears to be receiving a 100% feed from "Master" side of the cue. Unfortunately the (13) Cue / Master mix knob does nothing. Am I doing something wrong? Is there a mapping fix for this?