Edited activities on IOS app not showing on watch and elsewhere

Hi, this morning I did an outdoor swim which did not track accurately with the GPS, so I updated the activity manually on the iOS app. I changed the distance

 When I sync with my watch it didn’t change the activity on the watch or on my calories etc on the daily measure on the app. Is there a way of doing this?

in the end I deleted the activity on the watch in the hope that it would then sync from the app which has the updated activity. But no luck.

Any ideas would be helpful.