General web ring problem
...at least, I've seen it in the Free Flight and Soaring rings.
It's this: if you page forward through a ring with a partially full final page you never see the last page. Instead you get thrown back the the FIRST page. Hitting Previous from there does, however, show you the final page but I bet most people never find that out.
Looks like an elementary programming error to me, compounded by insufficient testing.