New forum message lay out. I hate it, but it's likely here to stay. All posts default to questions now if you type it in the quick create box and click Ask It, with no way to change it until you create it. Formerly this would create a discussion with a tick box to mark it as a question. So to convert it, after you create the question, click on Actions in the top right and then on Convert to Discussion.
Alternatively, go the long route when creating a post by first clicking on Content then Start a Discussion