The main reason is because you didn't put in the category listing the phrase indicating that it's part of the contest. I don't know if doing that will automatically cause it to pop onto the list or merely alert one of our many wonderful (did I say wonderful?) admins, who will do some back room magic to get it there. But the key is to put that phrase in the story header. Read the contest description to get the exact wording, then type that exact string into the category. If you didn't know, you can create your own category, and that is how it's done.

Also, I noticed the story is listed as a series. If it's a standalone story you should indicate so. I think, from your account, click the "my stories" link, you can click the "series" link at the bottom of your story and it will change to "standalone" or somesuch. It's been a while since I posted my last pathetic entry so I've forgotten the exact details.

Hugs
Carla Ann