Your courses don't appear to be properly cross-linked. To cross-link sections, you need to go to one of the “child” course settings. Choose Sections then click on the course link. On the next screen, you will see Cross-List this section. Click on the box and search for the “Parent” course. Choose it. Click on Cross list this section. Repeat for each child section
Check the parent course and make sure all of the people are there.