Assignments that have had grades already entered keep reappearing and there are no resubmissions.

Community Member

I have had an assignment that was graded and due about a month ago.  In the last few days, several students' show that they have a submission but when I open it, there is none.  The assignment was closed a week ago and this has occurred after that date.  I have tried re-entering the grades several times but every time I log into Canvas these asssignments are still there.  I have tried regrading them from the grades page as well as by going into speedgrader.  These specific assignments were in Quizzes but were open ended questions where the students typed in a response