Negative calorie adjustment

Hi wonder if anyone can help. I always wear my fitbit and read guidance saying if you do so and sync regularly u should tick negative calorie adjustment which I have just done and suddenly my steps which it showed from syncing to fitbit have gone however the calories it's adjusted for the steps is still there. Am I making sense? Why have the figure showing the steps dropped to zero? I suddenly feel cheated haha. Any help much appreciated xx