Most likely the page that is directly before the current
page was using a redirect, so when you 'back up' to it,
it simply forwards you instantly to the page you are on.
It would be fast, and possibly with no HTML code in the
page that would be rendered (only a script block), so
there would be no visible indication that there was a
page there at all. When you click your back button
multiple times, you are clicking fast enough that the
redirect page does not get a chance to load, and you
spring yourself out of the loop.
Try using that little down-arrow that is attached to your
Back button; find the URL you want to back up to (could
be 2 items or more down in the list) and click on that
one to back out 'gracefully'.
Garrison