High End WP Theme – Page not found

I need help. I have created an Events page based off portfolio items. I have 4 items loaded, however only (1) item show up after clicking on it, the other (3) show “Page Not Found”. I believe that I have each setup at exactly the same way so I’m perplexed as to what to do. Please see the link below as it’s one of the pages that can’t be found. If you click EVENTS you should see all 4 items.

http://justkeepsmiling.org/portfolio/jks-live-auction-2/

How do I resolve this problem?