The posts are being posted between certain people. Look carefully for the numbers as you come down the line. They are not syncronized. P.S. When things are happening fast refresh.
On a lot of posts, and not just long ones, I have noticed that the main forum will say "12 replies", but when I click on the topic itself, it will only list 11. I have to refresh the page to see the newest one. I think its a scripting bug, but we'll just blame it on Jason