Strange problem in checkout

[Solti]

Hello. I have very weird problem. I am Using VM 2.4.6 and Joomla 2.5.20.
My checkout config is set up to be for guest checkout just add product to cart, fill some user fields and a submit button. Everything works fine except that when i place a second order and i did change the values in the user fields in the checkout, back in the vm administration the second order is with the values from the first one.
No matter how many times i am accessing the checkout page, the fields are filled up with the values from the first order, even if i delete and put the new ones, the order i get is with the old values.
When a manually delete browser cookies the fields are empty, until i place an order....
Is this a session/cookie problem.
Is it have anything to do with the Joomla session lifetime?
Need your assistance, thank you!

[AH]

Consider upgrading to VM 2.6.10 and joomla 2.5.24

Your VM version is not secure, neither is your Joomla

Regarding your problem

Do you have any caching turned on!