what is going on?

so i just logged in my work hours i have a active job i work four hour **** and in our reasturant we have stairs that i go up and down from the whole time im usually sweating enough to wear i have to go wipe my face i logged it and it says that i burn 1004 calories from work and i also workout on my own and burn 400 which means i burn 1404 calories i only eat 1200 so im in the negative that doesnt make much sense to me because 1004 calories seems a little to high a estimate for what im burning at work but i mean i do sweat a lot at work and those stairs are no joke so now im confused do i need to eat more then 1200? i think going over is a little to high even though ever since i started working and working out i have been a little more hungry and craving bananas and peanut butter like crazy any ideas? 

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