Midi notes (primarily strings) bleed into other sections

Hi there!

I'm sure there is a very simple solution...but right now I cannot figure it out and its driving me crazy! Whenever I play my production in entirety, the string sections keep on bleeding into other sections, it seems like a couple notes are 'stuck'. Ive tried exporting the track, bouncing in place, etc etc and its the same thing every time!!

Please help 🙂