If you use the Single Player maps link:
http://forums.thinking.withportals.com/downloads.php?cat=10
There are no page navigation controls at the bottom, and the upper left border material appears at the lower right.

I'm no expert, but I expect a malformed post for Madness v1.3
http://forums.thinking.withportals.com/downloads.php?cat=10&sort_by=add_time&order=DESC&start=2
because if you change it to start=3, everything is fine.

EDIT: Fixed immediately by msleeper! Thank you.