To Fix This:
  1. Go to Core > Users/Access > Profile > Edit User Profile Data.
  2. Look up the student and click their name to enter their user profile.
  3. Under the System Information channel, click on Student Enrollments.
  4. Click on Edit in the enrollment row for the year they became a past student.
  5. Uncheck the Student role check box.
  6. Click Save & Exit.