@rap1001fly: Do you have Swimming selected as a workout option when the watch detects your steps (Apps > Samsung Health > Choose Workout > Swimming)? Can you try heading to Settings > Samsung Health > Auto Detect Workouts, and disable Walking or any step-based exercises to see if this helps?
Andrew I will try it today, my watch count more than 1km steps while I was swimming, more than 1000 steps, it's bad because it counts calories that I did not burn and steps that I did not had, many people complain about this problem and everybody ignore it I don't know why because its a bad bug, on mi band there is a app that don't let steps be registered while you are doing exercise because exercise has his own burn calories and it don't need to plus with steps calories. Thanks for the answer, if it not works I will return here 
