I've built a site using Wordpress and Atahualpa, and normally, I'd expect new post entries on the home page to start at the top, and work down to older posts. For some reason, this is reversed - new posts are put at the bottom, rather than the top. Here's the site:

http://www.andstill.org/

How can I reverse this order, so newest posts display on top?

by default WP displays the posts newest to oldest. The only way to change the order is to eithor add a plugin that does this or to change some code.

have you changed any of the code? if not try disabliging all your plugins and see it it works. if it does, add them back a couple at t time tioll you find the one causing the issue.