You could trawl through the event list of the track which does it:-)
If you know the note which does it, find it (them) in the piano roll, stick the play cursor on it, switch to event view and see where (or if) there's a note off close to the note on!
Make sure ALL the midi events are on the same channel too. You could have e.g. a "note on" for the note on a different channel to it's note off?
Again, check the event list to check ALL events are on the same channel for each track.
HTH
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