Complete wrong design by clicking "go to cart"

[harrison1311]

Hi, there.
I am not an expert, sorry, thought I am!
on www.jamoo.de i installed virtuemart (2.026d) and used a template  which is "General commerce" by shape5.com.
But due to problems in design i tried to install for the virtuemart a yagendoo virtuemart design for nice looking shop.

Meanwhile i switched off the yagendoo and set the virtuemart to default design.

Always when i click to "go to the cart" there ist a complete look , as if no css is loaded.

First question: How can I change this?
Second question: When I locked in as registrated user there is always he warning: "Es gibt keinen Zugriff auf die privaten Seiten."
(No access to the private sides)

Can someone help me? My english is not good, I prefer German.

Thanks, best regards,

Roland, from Frankfurt