You didn't log in to the account that binds with your mower. Account association and data sharing are not currently supported. It means that if a user has both an email account and a phone account, he cannot use his email to log in to his phone account and access the data stored on his phone account, and vice versa. So when a user logs in to an account that is not bound with the mower by mistake and does not realize that, they may wrongly think that the previous mower data has disappeared.
1.log out of the current account and log in to the one that binds with your mower.