You might have past homework assignments that are still showing as Waiting for submission or Overdue.
There isn't currently a way to automatically mark past assignments as submitted or completed in bulk, so you'd need to have teachers go into the assignment and mark them as completed.
However, there's no need to do this for assignments for last year or prior. We hide assignments from before the start of the current academic year on the parent Portal/Arbor App and Student Portal.
Past assignments that have been set as submitted will be visible on the parent Portal/Arbor App and Student Portal.