That's what I would think too!! I guess they figure that if you do a minimum of moving everyday, so they add the calories burned for it and with exercising you would still be in a deficit to loose?!?! Don't know if I make any sense...
Did the calculator take in consideration your muscle mass, age and height? We may weight the same but don't burn the same calories for the same exercise...it's a bit tricky and like you said very confusing!!!
Have you been counting calories for a while did that help you lose the weight?