Automatic update to 3.8.1 , header and some images not showing

I just got an email saying that one of my sites, which is a site for my church, just got updated automatically, which is weird because I never have my sites update automatically??? Now the header image is gone and some of the pictures in the widget areas??? This is very frustrating because I do not remember setting this site to auto update and it hasn’t done it before now. I’m sure I will be able to go in there and figure something out, but I wanted to vent my frustration and ask how in the world did this site update without my knowledge? This is precisely why I don’t always update to the latest version of WordPress. I would have at least made a backup if I’d known about the update before hand. ??