Tiny Tower For iPhone?

so I have tiny tower on my iPhone and you have "sales per minute" but I did a cheat where you fast forward time on your phone to get more coins for more floors and more sales per minute. 5 minutes ago I had 350 sales per minute (I was fastforwarded to september) and then I switched back to the normal day and the game says I'm having 0 sales per minute! :( please help