HOW TO STOP SFZ+ FROM CHANGING PATCHES UOPN PLAY?

I inported some old .wrk files into MC6 and imported by soundfonts into SFZ+. When I play the project, one of the patches gets changed. I looked in the event list and could find any events that would cause this.
 
So I copied the tracks from the problem project and pasted them into a new one. None of the patches were changed.
 
Apparently there is something in my .wrk files that is telling MC6 to the patch in SPZ+, but I can't find it to delete it.
 
Can some please help me resolve this problem because I have a lot of .wrk files.
 
Olushola