This may be a dup of #16368 (not enough info there to say).
If you edit an SSH key in Team settings and save it, the key is moved to the user's settings.
- go to https://bitbucket.org/account/user/<team_name>/ssh-keys/ where <team_name> is a team
- edit a key, change the label, hit save
observe that the edited key is now absent in the key list
go to https://bitbucket.org/account/user/<user_name>/ssh-keys/ where <user_name> is your user id
- observe the key is listed in the user's key list