Student changed sections, scores won't sync to SIS

[lfisher1]

A student had a schedule change, he moved from my Period 1 class to my Period 6 class. None of his scores from when he was in Period 1 will sync from the Canvas gradebook to our SIS (Synergy). And when I am in the Synergy gradebook, I cannot manually add his scores because any assignments that came over from Canvas say "This assignment cannot be edited" (I can only edit the score in Canvas, then re-sync it over). HELP!!