Thank you, Chris. I can see in the Pages list that I am missing some of the problem Pages.
Follow up question to avoid future issues:
The Pages do not have the same name, but they are similar (i.e., Learning Goals for Week One, Learning Goals for Week Two). Can the similarity in Page name be enough to cause this issue? Alternatively, I copied the different Pages' content as I set up the new Pages since they have very similar content and the same format. Could the action of copying the text have triggered this?
Quick note: I used the term "linked" to indicate that to me, the user, the Pages acted as if they were linked. Since it is not a precise term, I tried for the quotes to indicate that.