problem with the orders

[anakincedric]

Hello,

I currently work on joomla 2.5.4 and virtuemart 2.0.6, I have a problem during the stages of orders, for now here's the steps:
The purchase of a product.
Goes in the basket.
contact information.
Order Confirmation page.
method of delivery.
Order Confirmation page.
method of payment.
Order Confirmation page.
Finally purchased the product.

it always returns to the confirmation page of the order.

can not be simpler:
The purchase of a product.
Goes in the basket.
contact information.
method of delivery.
method of payment.
Order confirmation.
Finally purchased the product.

is this normal?

the client does not register when ordering.

thank you in advance