wonky layout of site when viewing topics

hi,
site www.ratemydive.com/forum.php

am having a problem, i have used connerhds miniportal mod and added a 3rd column to the template. the whole site appears to be fine and all the columns sit in the right place, however whenever you look at a topic for example here http://www.ratemydrive.com/viewtopic.php?pid=110#p110, then the topic is floating at the bottom of the other 2 columns instead of aligning at the top like on every other page

any ideas would be much appreciated. thanks