[Wikipedia-l] Bizarre "bug"?

[Larry Sanger]

On http://www.wikipedia.com/wiki/Civil_engineering
there are two phrases that are properly wikified:

  [[environmental engineering]]
  [[applied mathematicians]]

But both phrases appear with double brackets *displayed* and without a
clickable question mark.  What's even more bizarre to me is that the above
phrases appear alongside other such phrases that are structurally identical,
and those other phrases *are* shown with clickable question marks!  For
example, this

        Other parts of civil engineering include [[transportation
        engineering]], [[environmental engineering]], and [[construction
        management]].

is displayed like this:

        Other parts of civil engineering include [transportation
        engineering]?, [[environmental engineering]], and [construction
        management]?.

Help?

Larry