Hi @kathy_scott . Can you offer a scenario to help us understand?
If I could take a guess here, is your Canvas integrated with your institution's SIS like Banner or PowerSchool? If so, that would mean your student roles are automatically enrolled in automatically-created Canvas courses. When this happens and students drop your class you no longer can make them UNavailable nor remove them from PEOPLE, which means they area still visible in Grades until your Registrar/CanvasSystemAdmin/SchoolDistrictCounselororPrincipal/<whoever does the enrolling/unenrolling for the institution in the SIS> removes them from the SIS and then when your SIS syncs with your instance of Canvas to remove the students from your class enrollments.
Is this something like the scenario you're experiencing? The more tech/scenario details you can provide the faster (and hopefully more accurately our suggestions will be) to help you faster. Make sense? Tag my name in your reply if you don't mind so I get the notification to come back here.
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