User blog comment:Brandon Rhea/Ad Tests on Fandom/@comment-28083312-20170425160744/@comment-20644-20170425190912

There was a hiccup with the site this morning but it's been fixed.

There are ad placement tests that account for short, medium, and long pages. Short doesn't cover stub so it still assumes it has a fair but limited amount of text on it. If a page is a stub, there's still going to be whitespace for now. There may be additional changes we can make on that front later this year as we continue to fix ad placements, but we have to see what these tests result in first before we can get to that phase.