Native Instruments Playing through unreleated Audio Tracks!!!

[rockonswitch]

I could really use some help. I'm running Pro Tools 8 LE on a 2 x3ghz quadcore on leopard. It doesn't happen consistantly, but my Akoustik piano right now is playing through an audiotrack whenever there isn't audio in it. It's really annoying to have the piano constantly doubled through these audio channels because it makes the mix peak and also applies the effects from those channels onto the piano so i have a really annoying distortion on a piano which is playing in 3 or 4 tracks when its only supposed to be playing on the one instrument track.