When I add widgets to side bar all posts move right

When I move an available widget to the sidebar it moves all my posts and ads to the right. What am I doing wrong so everything can be properly aligned and I can keep my posts in the middle and ads and categories on the right sidebar? I am using the shopper theme 2 below. Thanks for your help!

http://www.zinruss.com/themes/shopping-wordpress-theme-2.html