Board Thread:Support Requests - Getting Technical/@comment-2020924-20150531065600/@comment-24409505-20150601090718

RansomTime, I think the circumstances could be similar to mine: someone enabled a wiki feature that has a custom namespace (i.e. "Top 10 List:") and then disabled it, the page continue to exist.

I just checked the Wiki Features log of the wiki and it looks like at the moment of the creation of that page (17:57, October 19, 2011), the following features were enabled: wgEnableAchievementsExt, wgEnablePageLayoutBuilder, wgEnableArticleCommentsExt, wgEnableCategoryExhibitionExt, wgEnableChat, wgShowTopListsInCreatePage. With the exception of the Top 10 list, I don't think any other feature uses a custom namespace, or could it be wgEnablePageLayoutBuilder (it doesn't exist anymore and I don't remember what that feature is)? On the same day, the user who created the page then disabled the Top 10 list feature (18:06, October 19, 2011). So it's quite likely related to the wiki features.