Calorie Counting Inaccuracy

It is happening almost every second day where the Garmin Solar fails to accurately count calories during my workout.

I have exercised for almost 1h30s and the watch only identified 90ckals burnt, which logic dictates, even at a low intensity, is extremely inaccurate.

This is by far the most frustrating experience ever, even a 1st Gen fitbit can get this feature right.