Think about this for a minute. Once the girls find out there's a spy and she took one of the roses, they'll realize they got cheated out of one real spot. So the producers cooked up this "mistake" to add that extra rose. This way the girls wouldn't wonder why there were 16 roses instead of 15. After all, there's always been 15 roses for the first round. They wouldn't want the girls getting suspicious right off the bat. It would also make sense that Katie was the spy. No one would suspect her because they're too busy feeling sorry for her. Sound plausible?