Parts on track don't play

Hi guys, I’m recording a tune and it currently has 24 working tracks. One of those tracks has five individual little guitar parts recorded on it. Its been working fine but all of sudden only one of the five parts on that track plays. The others seem to be muted. I checked them all and none are muted. Checked properties on all the individual parts and everything is set the same. All of the other tracks are functioning properly. Any ideas on how to possibly solve this would be greatly appreciated. Thanks so much.

Check to see if you have accidentally drawn an envelope on the track.