In /qa/unanswered the sub-menu item linking to "unanswered?by=selected" gets put on the class ".qa-nav-sub-selected", which is also used to tag the anchor of the current location in the menu tree.
A simple workaround is to put a more precise selector in "qa-styles.css":
.qa-nav-sub-link:hover, li .qa-nav-sub-selected {…}
notice the "li " that makes this one only match for elements below "li", but not "li" itself. , This way though, you may probably loose some wanted feature, so:
Of course the right thing to do was, to name the selectors differently in the code, depending on what is wanted and when they should match!
Kind regards
Peter