The three options pages, that are displayed, are all endpoints of explicit redirects.
- “Page Template Settings” is missing, but it redirects to “Pagestyle: Classic Layout,” which is printed.
- “Documentation” redirects to a subpage, but there are none, so it is printed.
- “Calendar API,” too, redirects to a subpage, but there are none, so it is printed.
I do not know what to make of it though.