This did not used to happen, but it did happen this term. It is causing me to have to manually go through the hundreds of boxes and delete the 0s.
I am fairly sure that the reason is that, when I ported all of the content from a previous term, some of that content had due dates in the past. When I updated the info for the future, the zeros were still there. If a student added the class late, they did not get the 0s because they weren't in the class when the assignment had the old due date.
What we need is a system wherein when we change a due date to the future, any 0 grade gets replaced with a not-submitted blank. We also need a way to auto-fix all of these future 0s so that I we don't have to sit here and waste time manually deleting them.