The XML Special:Pages export is bundling all revisions instead of just the latest,
whatever the user asks for in the export. This started on Sunday 6 August.
Here is an example in a Wiki which uses Wikipedia pages "On the fly":
http://www.wikinfo.org/wiki.php?title=Doune. The page "Doune" didn't exist in Wikinfo
(at time of writing this anyway). Wikinfo try to import from the XML and this happens.
Here is an example of my own website in a test page:
(see bottom of my page)