Okay, here's what's going on. Basically, they haven't taken the money out of your account because they haven't found a bank to buy your loan yet. That could be because the paperwork on their end is slow or because of bad credit, but either way, that car is still theirs until they take that payment and can repo it at any moment. It's probably nothing to worry about, but that's what's going on.
I have a friend that her dealer did that to. Luckily for her she had buyers remorse and sighed relief when they couldn't get her financed. Saved her a $400 monthly payment she didn't really want.