Which of my rosters is the most up to date - Brightspace or SIS?

Your SIS roster will always be the most current, up-to-date roster. If a student has shifted Brightspace sections or withdrawn from the course, their initial enrollment will still show in the original, old section. To clean up your Brightspace roster, you can go to:

Course Tools > Classlist > place a check next to the students that need removed > Unenroll