The problem is its I absolutely always have "0 calories" remaining.
And it does not depend on whether I have or have not eaten on the day. I thought it must be a mistake, so I deleted the app and dl it again. But it didn't change though...Its a bug, right?
Calorie budget is the total calories you need in a day depending on your metabolism (dependent on your age, BMI, family history, genetics etc) and physical activity level. This budget helps you understand the amount of calories you can safely consume without adding weight. The over budget indicates the number of total calories you have gone over the budget. The 1693 may be the total calories gone over the budget. Take care!
The medical advice given should not be considered a substitute for medical care provided by a doctor who can examine you. The advice may not be completely correct for you as the doctor cannot examine you and does not know your complete medical history. Hence this reply to your post should only be considered as a guiding line and you must consult your doctor at the earliest for your medical problem.