Coursepress Pro Post-navigation Orders

We have five courses that are to be taken in order. At the bottom of the course overview is a set of navigation links to go to the next course or back to the previous course.

1.Why do these not go in order of the post id or date? We have already tried changing the "Course Order" in settings.

Shouldn't the navigation go: course 1 -> 2 -> 3 -> 4 -> 5?