WooCommerce paypal problem

Hi there!

I have a problem with my WooCommerce-Installation. I have installed WooCommerce and WooCommerce Germanized. In case of paying by paypal two problems occur:
1. When I will buy an asset and I moved this product to the shopping cart, I will leave the cart with the button right down at the bottom. Then I will come to the check-out-site. When I click the buy-button there paypal will open and I can pay. When I have paid, I can leave paypal and I will get back to the confirmation-site. But there is a button called “pay now” (“jetzt zahlen”) again. This is very confusing for the customer. How can I avoid this?
2. When I go to the backend to the list of all orders (woocommerce-menu) I can see the order I have done in 1. But there is the information, that the order has to be paid. But I have paid the order (see 1.)!!! And later I can see, that the order has cancelled?!?!?! How is it??