updated to 1903 and my correct password was not accepted

I have a password manager which I checked (on my phone) also checked my password book. I had enetered the correct password! Had to go through an unbelieveable password reset and finally got it accepted. When the screen opened, my wallpaper was gone and most of my programs like Thunderbird ,etc were gone. A few programs were there, but they did not recognize me and asked me register! It was almost like it was not my user account. I rebooted and chose Macrium recovery and restored from the image I had made yesterday before the update. I then turned off updates for a month ( I have winpro). I got the notification right away that there was a user account problem. I had to sign in to windows using the new password and it was fine.
I would like to know what went wrong when I updated and if it will happen again when I finally do have to update to 1903. I can't find anything about it online.
Thanks,
Joyce

It definitely was not my profile. However, I did not get the warning that was described in the link you sent me, and I only have one profile with me as admin on my machine. I also have my computer set to not even ask for a password when booting. So I am still confused by the whole thing and I am afraind to try the update again.