Students Don't Show Up When Grading
Summary
There are various filters that can change what students show up when grading assignments. You can see in these screenshots that one student did submit the assignment, but 0 of 0 students show up when selecting the Grade button.
Solution
There are two possible issues happening. Both issues relate to a filter being set to limit which students are being shown. Clicking the “Reset table preferences” or clicking on the filter icon and setting the filter to All will then show all possible students in the course.