Mini Portal

Ok so i followed the mini portal exactly as it says on the wikipedia thing. It works and all but i found an error just today. One of my members made a reply to my post I have in the new section. This post they made is the 8th post made in that topic and it now replaced the main post that is on the index. So for say at first it said

Topic name posted by Mikey B .....

Hello this is the post

Thats what it would currently be but then on the 8th post if someone would right

This is awesome. it now shows on the index page

topic name posted by Mikey B .....

This is awesome.

Why would this be and its onlythe 8th post that i know of becuz i replied before i saw what happened and it showed his still ut not my new reply. I also deleted his and my post and its now back to the regular post that should be there..

Anyone know what the problem could be or is? If need more explaination just ask.