Shouldnt have too. I didnt manually have to modify any templates in order to change it in my forums here
http://www.romesleague.com/forum/
Notice how they are centered. That was done withough modifying any of my forum templates. It was done in the general settings, I just cant remember how I did it.
And Im wanting to get my forums here to do the same
http://romesworld.romesleague.com/forums/ before I get the rest of the site up. Its just that now that I upgrade from Vbulletin3 Cantidate to the 3.0.0 V3 version I cant figure out how to do it again. I didnt change any template with the cantidate version and I had no trouble with overlapping tables..