I'm just a user by the way, not a forum moderator, but since I was here anyway checking on my query, I thought I would chime in...
As long as your students' enrolments are Active (not Suspended), they should be included in the Grader report, I believe.
I also see that your students don't all have the same Role (adult volunteer vs youth volunteer). This may be an issue with Permissions related to the Grader report. Perhaps you could check those, and see if relevant permissions are set correctly for all your student roles.
All the best,