Well I guess the title explains it all…I have a ten second sample here and the “OFF” doesn’t make it stop playing, even if I have the NNA set to cut! 
Do you have an instrument envelope defined, which has a sustain and long release time? Would be nice if you could downsample the sample and post a little example song, so we can have a look at it.
no envelope defined…will try to post smthing!
and did you set the ‘off’ (done by capslock) in the same collum as the sample that must be stopped? (exacly under it)?