When I am using Speedgrader, it will show in the grading column, "Submitted: no submission time."  However, in the submission column, it says, "This student does not have a submission for this assignment."  And, in the drop down roster, it shows orange dots, indicating something is submitted, even though it isn't.  This isn't affecting every student.

When it is a discussion, I have double checked that the students have actually not participated, and they haven't.

Help?!