Open the “Performance” tab and make sure that “Global Ch” matches the global MIDI channel setting on your Nord Lead 2X. Then, fetch the current performance from your Nord. The Performance information tells patch base which MIDI channels each of your synth’s slots are assigned to.
To view the global MIDI channel setting for your Nord Lead 2X, hold Shift and then press the “MIDI Ch” button (with “Unison” above it) twice. You’ll see “G. “ followed by the value for the GLobal MIDI channel of the Nord.