iTunes U course enrollments will not show up

I created a class in iTunes U. When I first started the class, I could see which students joined my class. Now, I can see the number of students, but I cannot see who they are or the work they submit. When I am at the main screen for the course, all the numbers are in blue creating links for me to see Posts, Discussions, and Materials. The number for enrollments is grey. How do I fix this?