block link in my theme has slipped onto a new line

Hello,

I have tried to modify the wordpress theme i am using, which almost worked. I copied the code exactly but one of the blocks on the front page has slipped onto a new line and i can’t work out why.

You can see the problem here:
http://www.globexposure.net/artbytereska/?page_id=5

The ‘SHOP’ block has dropped down – you can see it half way down the page.

Please can someone tell me how to fix this?

Many thanks for your help.