An edit conflict should have been registered in the following sequence, but the second edit was saved anyway:
- http://en.wikipedia.org/w/index.php?title=Pensacola_Christian_College&diff=170548221&oldid=170540650 - User Zach4636 "undid" an edit made about 1 hour earlier.
- Before the above edit was saved, User Orlady had opened an edit window for the same article in order to remove a user's signature from the first line of the article. (This signature was part of the same edit that Zach4636 undid.) The edit was submitted two minutes later -- http://en.wikipedia.org/w/index.php?title=Pensacola_Christian_College&diff=next&oldid=170548221 -- but it had the effect of restoring most of the content that Zach4646's edit had deleted.
An edit conflict should have been registered, preventing the second edit from being saved in this way.