Checkout page display issue

HI,
after installing the plugin I came accross an issue with how the checkout page is being displayed. The login feature is no longer displayed above the checkout form. Instead it is now on the left hand side of te checkout form fields block. This has also pushed the shippment and payment blockes to the bottom of the page, while they should be visible on the right hand side of the checkout form block. Overall these 3 blocks are not being displayed in the correct place which makes the page messy. Apperiate anny suggestions on how to fic this. Thank you!

The page I need help with: [log in to see the link]