Most entries don't have calories shown (Read 298 times)

When looking at my workouts most my entries do not show calories. I can not make sense about what is different on the entries that do show calories and those that don't. What determines if my log entry will calculate number of calories.

My entries are running, biking and swimming. Most of the running, swimming entries are creating using a garmin import but they all have activity, workout type, distance and duration listed.

any help is appreciated.