Suggested edit approval rules were [revised few months ago][1] and now require a majority of 2 votes to be approved/rejected.

The edit on http://superuser.com/questions/529274/microsoft-word-2007 was approved by you & needed another approval vote [to be vetted & passed through][2], which I have done now & hence is accepted. 

The [other suggested edit](http://superuser.com/review/suggested-edits/68940) was already approved by one user and needed a secondary approval vote for it to be accepted, and since yours was the second approval vote, the edit got accepted when you clicked approve.

So yes this is a feature, not a bug.


  [1]: http://meta.stackexchange.com/q/151536/133693
  [2]: http://superuser.com/review/suggested-edits/69199