I have recently noticed the password data getting deleted from my account and I can't see in the password in the account history as well. I am a premium user and the support team is saying they can’t do anything about it. They suggested to just monitor my account incase there are any future data loss.
I am sure the password was stored in lastpass as it is the one website i use daily and lastpass is the only place i save my password.
Hence beware everyone, start making backup copies otherwise you will loose sensitive information.