I just took a look and it seems you had the categories numberous times in source mode. tried fixing it manually but the categories still don't appear, not sure why. try sending in a bug report. the last two pages on that list are fine though, just wait for the server to update the cache. besides that you are good to go :)
haha just tried again by adding directly at the bottom of the page, that didn't work either on page refresh. let staff know about both that the bottom and in article doesn't work. Might want to check your wiki's css or js.