Kind of misleading

If you set up MFP according to Guided goals, the Calories you need to eat each day at the rate of loss per week you chose does not include any additional Calories you would gain for logging exercise for that day. So let's say you wanted to lose one pound per week and MFP guided goals gave you 1500 Calories per day as a goal. If you did not perform and log exercise, you would eat to the 1500 Calorie goal.

If tomorrow, you log 200 Calories from exercise, MFP would add those Calories to your daily goal, so tomorrow you would have 1500 + 200 = 1700 Calories goal. You would still be losing weight at the estimated rate of one pound per week, because that was included in the MFP guided goals. You would have the choice not to eat or to eat those extra Calories - that is what is called eating-back your exercise Calories - some people don't, some people eat back a percentage, some people eat back all of them. Note that exercise Calorie estimates are just that, estimates.

Please read this article from the MFP Help pages...
myfitnesspal.desk.com/customer/portal/articles/410332-how-does-myfitnesspal-calculate-my-initial-goals-

Its set up to eat back your exercise calories. I personally use a different method, so mine are built in already. But your fitbit is giving you back the calories you burnt during your workout. Many use that method, and it works just fine for them. Its also a good way to ensure that your getting enough calories per day, as that's important. Some only eat back 50% of the calories they've burned. Its trail and error, see what works best for you.