MIDI crossfader won't cut one side

Hi all, When I map crossfader , it won't fully cut on one side , if I push the auto crossfader arrow, the xfader jumps one more bit and cuts out, M70 digital mixer, Works fine in traktor scratch but just converted, I use the mixer in normal mode instead of MIDI for now.
The time code vinyl rocks.
Thanks
The time code vinyl rocks.
Thanks