Board Thread:New Features/@comment-9605025-20170326092153/@comment-1595427-20170326200530

Other users can tell you if they are having the same problem but I think you found a bug. Which should be reported via Special:Contact/bug to Fandom staff.

Edit: I just tested it my internet explorer does have the problem. But Chrome does not. And I see the modern header with both. Edge and Firefox displays the old header (which I think is they meant to do).