Any Jawbone UP users here?

Options
I started using my UP band back in November. I really enjoy tracking my activity but I'm slightly confused by the sync with MFP. When I exercise I log it on the UP app and then it syncs with MFP and tells me how many calories I've burnt. Towards the end of the day though my measured activity decreases on MFP and the cals burnt therefore drops. Anyone know why this is?