Permalink problem in CoursePress Pro v2

Subsite: essentialoisacademy
Course: Essential Oils 101

I am experiencing a problem progressing (navigating) the unit pages. In unit 1 there are 2 pages but you cannot progress to page 2. I noticed that the permalink changes but rather than the correct unit page the permalink has /page/1/module_id/634

I am only experiencing this problem between these 2 pages in unit one.
If I go directly to other units, I can progress ok. Also, if I change the unit title, the permalink does not change. Could this be part of the problem? I do not see where I could edit the permalink if the unit name is changed.