[Plugin: WP e-Commerce] problem with combining MYgRID2 theme

Hi,

I am trying to use te wp e-commerce plugin in the MYgRID2 1.3 theme. U can see it here. http://shop.pieterzandvliet.com
Everything looks nice and all, and it seems to work. The only problem is, when i click on a product, to go to the page of that specific product, my widget bar moves down the post, instead of staying next to it on the righ side. (example: http://shop.pieterzandvliet.com/products-page/paintings_on_canvas/canvasdoekje-nr-1/ )
How can I solve this?

I can’t find any contact details of the developer of the theme (Dannci), so I just try it here.

Thanx in advance,

Itam.

http://ww.wp.xz.cn/extend/plugins/wp-e-commerce/