MFP exercise calories?

I was just out running with my Fitbit One, and Fitbit says I burned about 330 calories (which sounds very accurate). MFP however only show -71 as exercise calories. Which one should I listen to? I have no idea how much to eat now since MFP and Fitbit say different values.

They are both synced by the way.

Or is it me who don't understand how they work?