Log in & admin password changed, and other user Avatar.. Help!!!

Why this happened - do not know why.

1 - Verify User Account as True or False

id -Gn username | grep -q -w admin && echo True || echo False

If the $USER  is admin then True will result.

Credit @VikingOSX

Reset Computer Password  for the Administrator Account Password

2 - Apple Silicon M1 / M2 Computer 

1 - Choose Apple menu > > Shut Down.

2 - Press and hold the power button on your Mac until you see “Loading startup options.”

3 - Click Options, then click Continue. 

4 - Top Tool Bar >> Utilities >> Terminal

5 - Type resetpassword as one word and no spaces

6 - Press Return key

7 - Follow the prompts and remember the New Password

EDITED - added Infomation

Great New and you are welcome 🇨🇦

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You are welcome.

Keep us posted on the progress - time permitting and hopefully successfully