User blog comment:Sarah Manley/Test the Expanded Wiki Navigation/@comment-3971662-20111102012710/@comment-957747-20111102021339

Sounds like an issue with the menu items taking up more space than is allotted for it. Try viewing the wiki in Firefox or Chrome or IE at normal size and see if the same thing happens. If it does, a redesign of the navigation menus should follow to ensure there is enough space to fit all menus.