New
#21
Typically you will fail to sign in, then see a duplicate user name if you have set up Netplwiz to sign you in automatically, but it is using the wrong password. Your user name will appear twice, once as the correct account with your picture, and again as a 'ghost' account with the default user image. This was probably a leftover after the shop reset your password, they didn't change Netplwiz and it still had the old password.
Here for my account named Owner I set it to sign in automatically with the wrong password in order to recreate your screen....
Run Netplwiz and either tick the box for 'users must give a user name and password....' or set it up to sign you in with the correct password.
PS: note the third account in my screenshot. That is another local administrator account, there for emergencies. I strongly recommend you set up another local administrator account so you have a second way in, should you ever get locked out again. Don't use it as a regular account, just keep it in reserve for if/when needed.