My board became someone else's

@Nicolas C - You could have been deleted from the team at which point your content (boards, projects, custom templates) were assigned to someone else and then you were re-added to the team.

If you are not a Team Admin of the team in which the board resides, this could happen to you at any time.

You’re welcome!

This is just one of the ways that some team admins gain control of a user’s board in the event, say, they are on vacation and someone else needs to facilitate a session using tools only available to the owner of the board.

Another option could be to duplicate the board, but this may be always be possible, e.g., the board content settings may not allow for duplication.