I was literally just "logged in" as you on my PC! In trying to figure out WTF was going on, I then was signed in as two other accounts. Ever since the huge increase in users, logging in on my PC has been fickle but never saw another account just the login option. Hopefully it's an easy fix, pretty weird!
Edit: It's now up to 7 different accounts, user interface preferences even. But as soon as I click on anything, I'm fully logged out and see the login option.