layout problems

[monstermunch]

Hi,
Im in the middle of changing the style of my vbulletin board and have a strange problem i cant see to work out.

the threads on this page http://www.avmechanic.co.uk/help/showthread.php?t=4 , seem to be the wrong page width for some reason when they should be 100% like the other pages are http://www.avmechanic.co.uk/help/ and http://www.avmechanic.co.uk/help/forumdisplay.php?f=24

does anyone have any ideas why that would happen? or where i should look, im at a loss at the moment.

thanks