To see and fix this, navigate to:
  1. onCampus > People > Academics
  2. Search for Course that is Duplicating
  3. Click Edit
  4. Switch to other Term(s)
  5. If there is no Teacher listed, click Add Teacher
  6. Search for the Teacher
  7. Click the >> to move the Teacher to the Added Users Section 
  8. Click Next
  9. Select the Teacher Type, and if they are the Head Teacher
  10. Click Save and Exit