I have no idea what's eating the first two headers. But as you can see from the current page, it's not just headers by any markdown...
--[[madduck]]
+
+> This is a markdown bug. It occurs with 1.0.1, but not with the 1.0.2
+> beta. Apparently markdown is getting confused by the div inserted for the
+> toc, not realizing that it has ended, and so not marking up the text as
+> markdown. 1.0.2 fixes many such div-related markdown bugs. I have to call
+> this [[done]] since it's not an ikiwiki bug, recommend upgrading markdown
+> if the slower speed of 1.0.2 doesn't hurt too badly. --[[Joey]]
+
+>> Note how it works on <http://madduck.net/docs/mailfilter/> but adding a rule like in that doc to the people page didn't fix it.
+
+>>> Yes, it's probably confused by the two divs so close to each other, and
+>>> doesn't realize that the text in between is not part of either and is
+>>> markdown. Problem is that the old markdown doesn't have a real html
+>>> parser, it just fakes it --[[Joey]]