Quoting Sarah Bare-ah♡:" Oh smurf. Thats no good "
If you look at your data straight across, you have "Goal" "Food" "Exercise" and "Net"
Goal is how many calories you want to eat per day. Entering in your food consumption takes away from your daily allotted amount of calories left to eat. When you exercise, it adds calories to what you can eat. Net is how many calories you have consumed after subtracting how many you've burned with exercise.
I started with 1240 calories to eat. I've eaten 1112. That would leave me 128 calories for dinner, but I burned 592 at the gym, so I've "eaten" 520 adjusted calories today and I have 720 left for tonight.
You either need to enter food you forgot on your MFP or you need to eat more.