It's possible to "unprotect" a page without protection ever having been set. If you use &action=unprotect on a page and confirm the protection, it leaves a log entry.
Generally this wouldn't really matter, however, people sometimes use scripts and they accidentally hit the wrong button / link, causing an awkward log entry.
Version: unspecified
Severity: enhancement
URL: http://en.wikipedia.org/w/index.php?title=Special%3ALog&type=protect&user=&page=User%3AMZMcBride%2FSandbox+7