When I look at a user page (take this for example), if the user has asked questions, they show in the Questions list. That's fine and expected. However, if the user has marked a question as answered, it does not indicate that unless you click the "View More" link.
Above, in the Answers list, it shows whether or not the user's answer was accepted, so why wouldn't it show it in the Questions list? On stackoverflow this works as I'd expect , so I think this may just be a styling issue or a bug that was overlooked.