Lead Instrument no working on every note

I imported a midi file and assigned different instruments to the lead. It does not play every note. When I select the note with the cursor, it plays, but using playback, it does not.

I have not experienced this with any previous projects.

It’s possible that some of the timings got messed up in the import. Can you send me the midi file you’re using? That can help us to isolate if there’s a bug