Numbers question from MFP

Did 35 mins on elliptical, machine says 570 cals on machine, Seems high. I don't do extreme speeds and about 6 resist (I know they are all different) Point is, I undercut my cals, so I put in about 450. But when I choose 30 minutes, my cals are in the 400 range on the MFP site..if I put in 35 mins they are like 800. Am I missing some thermogenic reaction or something ? Cals doubling in 5 more minutes seems a bit much.

If this is the case, I am going back down for an hour later! :)


EDIT: disregard, it was not calculating the 30 minute number properly. User error, move along, nothing to see here but an idiot and his keyboard.