Why has my lock screen profile picture suddenly changed?
After years of using a particular stock image profile picture, I've just seen a different stock image appear above my name on the login lock screen. I'm afraid to type in my password in case I've been hacked in some way, so I'm posting this question from a different device. Please can someone advise? What is happening, and what should I do? Is it just a bug related to an OS update? Or something more?