yes first post of a topic must be first in the topic, that is how i see it dont know why is not same for you
to check this out tell me where do you have this problem, in which forum or is it in all forums here?
for this forum
http://bvlist.com/p2p/forum/general-discussion go to the bottom of the page and see if the settings for Display Options are
Sorted By - Last Post Time
Sort Order - Descending
From The - Beginning