Update….
The page in question is the one named after the member.
Example: blah.com/user005
It is the “User005” page that fails to appear.
The child page named after the membership level (i.e. blah.com/user005/membership-level) does appear, but the “user005” portion of the URL is mysteriously removed when that page renders (i.e. what appears is at address blah.com/membership-level).