DJM-S9 with traktor 3

Hi There 

I just set up a midi mapping for my traktor 3 DJ software. surprisingly, I realize, that both rotary push-knobs and both BACK buttons has the same adress? It seams strange for me because all other buttons have different adress weather it is on left - or right side located. Does not make sense at all.

PUSH funktion of rotary knob has Ch07 Note F5 for both sides and BACK buttons  both have ch07 Note F7.