Calories deleted/removed from move ring

I am getting very annoyed with my watch and an odd glitch it seems to have. I run on a treadmill and use the workout app to monitor it. During the workout I can see my calories adding on to the move ring as normal then when I open the app again my calories have disappeared all the workout data stays in tact and the exercise ring remains closed but the calories don’t show, even after I’ve had the ring closing notification on my watch during the work out. It’s so frustrating what’s going on?