Here you are the files confirm.php and checkout.php
If you want the check what happens, please visit www.karmensita.com and make a purchase by selecting the button ENTER THE SMALL SIZES SHOP. You can do that since it is in test mode. When you are asked for the username and password, type:
When you reach the bank page, you will see that the amount passed does not correspond to the total amount on the confirm.php page.
Also, I have enclosed some screenshot of the ecart object.
Thank so much you in advance.