It is because the game was sent before you deleted it. The order depends on whether or not they have the top games available. If you have several newer games on your list for the top, chances are that they won't be sent until they get a little more common. You should try to get more games that are not as new to make sure you get a game you want and not just games you don't care about. Better yet, don't put games on that you don't want in the first place.
usually, the games do get released later on gamefly then they do from the regular shipping date. my guess is that it is because of companies wanting people to buy the game before they can rent it for more sales.