Blog posts appear in wrong order

This blog post:

http://extranet.atlassian.com/display/~cmiller/2008/01/31/Open+Company%2C+No+Bullshit

was posted a couple of hours before this one:

http://extranet.atlassian.com/display/~cmiller/2008/01/31/Apropos+of+nothing...

However, in the right-hand-side previous/next post navigation, they appear in the opposite order.