weird forumhome

[omega buster]

i have little problem on my forum
here,take a look at http://www.gameplanetz.com/forum
when you not logged in,the table size on forumhome get bigger(using Default syle)

but after you logged in,everything went normal again(if u using another style named "Grey")

any idea why?
can i replace my default style?or just delete my default style?
i created an test account so u can take a look
user: vbteam
pass: vbulletin
go to user cp to change the style set

Thanks
ps: sorry for my poor English

edit: now even i switched to another style the table still big.could somebody help me to get a rid of this??