You carry your bag for two hours and never put it down?
I'm sure golfing uses a lot of energy, but also from what I know, there is a lot of time spent standing around doing nothing while waiting for other players to do their things.
Also, when you are walking around the green, looking at the grass deciding how to putt -- not exercise.
When running Other workout, it credits you with calories for a brisk walk, no matter what your heart rate. I have no idea how walking around with a full golf bag over your shoulder compares calorie-wise to brisk walking, but if you play golf for two hours, surely you weren't carrying that bag for the full two hours.
It's just that after sitting and reading my iPad while running the Other workout and seeing how many calories it credited me, I just don't trust it at all.