Sandy,
Something similar happened to me a few months ago. It turned out that the program wasn't recording the movement through the status steps. It didn't affect the actual performance of my campaign and we did have successes, but for some reason we couldn't see them easily using a smartlist. Will is correct - contact support to be certain, but it could be as easy as adding flow steps to your programs to ensure that your reporting reflects what is actually happening.
Good luck!
Patty