MarketPress issue and question :D

I have a small issue on a client site easypayfurniture.co.uk, where when a product is added to cart my clients details are automatically added to the shipping details, I have no idea where MarketPress is finding these details and is a small security risk.

Also I am having trouble integrating it with my current site as I cannot find the correct CSS rule as the last items in the store is hidden, you will find it out when you hover over the last few items.

Thanks for your fantastic help