Why does my game get deleted?

So use an IFRAME of my website, https://gatheringofmagic.com to run my game.

It gets deleted by the website for "not having kongregate.com's login/register APIs"/

While i just checked, a nearly rated 5 star game has their own database, login and register functions that aren't seemingly tied to your kongregate account.

http://www.kongregate.com/games/tfender/contract-wars

You sign up on their website, just like mine, you register on their website, just like mine.

What's the problem?