Cannot update my weight in profile

I have tried to edit my weight in my account settings to show my hard earning weight loss. However, when I change the weight and save the changes, it reverts back to my original weight. The same applies to my target event date?

Do you happen to have an activity that is dated into the future? You may try and remove that activity and try again if so.

Yes I did, was trying to amend the date but no joy. Deleted the activity and all is working fine. Thanks Armando.