2 consecutive logins (with 2 different users)

I just bought a new MacBook Pro, and I'm having some trouble with the log in.
I transferred my documents from my PC to my Mac, but then wanted to change the username. After changing it, my documents were gone, but I found them under "users" and copy/pasted them into my new user. In order to change the username, I had to create another administrator account, which I deleted immediately after.
Now, when I start up my computer, I am forced to log into the second administrator account I created (which I deleted and is nowhere to be found!), and then into my user account (the page has a red background for some reason).
I'm really confused as to what is going on... Everything is fine once I'm logged into the second account, but I would really like to fix this.
Thank you! (I hope I was clear; feel free to ask for any clarifications!)

 

Ok, so I appear to have fixed it... I saved all my files on an external drive, then deleted the problematic account. I made a new account with the same name as the one I just deleted, and when I logged in, all my stuff was there, and everything was working!