In this revision (normal output, not VE), the navbox looks bugged because it is sitting on the same line as a list item:
http://en.wikipedia.org/w/index.php?title=History_of_Delta_Air_Lines&oldid=561463069#External_links
But VE shows the navbox as if it was on its own line.
This display fault caused a user to save the revision in question, thinking it was formatted properly. VE should probably be leaving block templates on their own line. (Is that another bug?)
Version: unspecified
Severity: normal