If I’m not logged in on the main site, then the “Unanswered” and “Ask question” links are superimposed in the menu in the header. Here’s a screenshot which illustrates the behaviour:
Hovering over the superimposed item, the “Ask question” link gets highlighted.
The behaviour doesn’t occur on your Meta site. I assume the menu is supposed to be the same, whether or not you’re logged in, but at the moment it isn’t.
I can reproduce the bug in the latest versions of Safari and Chrome, running no third-party extensions, in OS X 10.9.3.