User blog comment:BertH/Layout and navigation updates coming October 3/@comment-5072107-20120920192532/@comment-1474707-20120920200734

Yeah, I'm always dubious of the results of the "tests" Wikia uses for reasoning behind changes. For example, this Oct 3 change will restore a divider between the page title and content, something which "A/B testing apparently said causes 11% less editing.

I bet that the "click tracking" did not include clicks of Wiki activity and random page on the old system, but included clicks of them on the new system (as they have been moved to part of the wiki navigation)