What is with the whitespace between a question's title and its content? I do not have this when I post on Stack Overflow:
By the way, the question above is not mine (the URL is https://superuser.com/q/606969/222470).
Looks fine to me over here. My guess is you have an ad-blocker turned on, since that's where the ad would go. Ads are hidden once you reach 200 reputation points. Since you have >300 rep on Stack Overflow, and <200 on Super User, that explains why you're seeing it here and not there.
If you turn off your ad-blocker, then I'm guessing a banner image will appear in that space.