When exercise doesn't count

Food Diary
weetabix
cherries
crunchy nut flakes
cherry tomatoes
baked beans on toast
grated cheese

FitBit (at 7.42 pm)
5,744 steps
2.45 miles
1,448 calories

I wasn't wearing it for a while this morning while it charged but I did Thrive circuits tonight so I'm sure I've actually used more calories than that.