Activity and Health App on IPhone 6s is not syncing fully with the activity data on Apple Watch. Some activities are in sync while some are not. It was ok before.

Activity and Health App on IPhone 6s is not syncing fully with the activity data on Apple Watch. Some activities are in sync while some are not. It was ok before.

I have noticed this issue before also but previously it was getting synced after few hours. Now, not the case. I have already tried updating both my phone and watch with latest software versions, unpair and re-pair the watch but it’s still the same. Please advise.