getmovin,
One thing, I've occasionally found the need to refresh the screen if I am moving from day to day. What I will see when I expand a dropdown arrow is the graph from the last day I was looking at. Refresh solves this 100% of the time.
As to the difference in calorie readings you are seeing. Any chance you are confusing the total calories burned amount shown for the day with the amount shown in the adjustable slider of the graph below. Hoping this picture explains what I'm talking about
