Cardio workout recognize as activity 'other' instead of 'cardio

I set up a cardio workout from the existing ones in Garmin Connect. The workout is synced with my watch. If I want to start the workout it is not automatically detected by the start of the cardio acitivity. However, if I start the 'other' activity the workout is suggested. Why does this not happen at the cardio activity? Can I change this?