This can occur when two different teachers are marked as the Head teacher. To correct this:
  1. Go to onCampus > People > Academic > Course Teachers
  2. Search for the class and click Edit
  3. Take note of the Head teacher in the first term
  4. Select the next term from the Term drop down
  5. Select the original teacher as the head
  6. Click Update Head
  7. Repeat for any additional terms or courses