clicking on the links for 'questions' or 'unanswered' just takes me to a page

When I click on the Questions or Unanswered links at the top of the page, it is showing me a page that I have elsewhere on my site.

These links work ok though:
http://theisleofavalon.com/questions/ask/
http://theisleofavalon.com/questions/where-is-a-good-place-to-learn-holistic-therapies/

I did use my page template to edit the default template files, so maybe something happened there. What are the template files that is used for the two sections?