Hello me again

When posting in a sub forum, the 'last post' information on the forums main page is not updated to reflect this change, it is only updated when a post is posted in the parent forum of the subs.
It also appears to be the same on this site (WWG).
Is this a bug or is this intended?
P.S. My forum running MySQL version.
EDIT: I've just noticed that this is true for the 'Whats going on?' info at the bottom of the main page, it also only shows the latest post made in main forums not subforums.
Edited by Mikey - 12 January 2006 at 1:01pm