User blog comment:Dopp/Technical Updates: November 1, 2011/@comment-954127-20111101235524/@comment-1997905-20111102124316

It just happened here, too. These are formparser errors and have been around since the RTE was first released. Despite literally tens of thousands of occurrences all perfectly preserved in page histories, the error has yet to be fixed. It's frequently used as an example of how Wikia's improvements are generally handled.