Nodes don't get published when users don't return to website after paying with Paypal WPS

Hi everybody,

I am using Commerce Node Checkout to Allows users to pay to publish nodes. The nodes should be published when the website receives payment from Paypal however, despite that the website receives and validates the Paypal's IPN and the the order status is updated to completed, the nodes are not published when users don't come back to website from Paypal.

To Recap:

Case one (users pay and come back to website)
1. User creates a pay to publish node
2. Node added to shopping cart
3. User goes to Paypal and makes payment
4. User redicted back to website
5. Website receives IPN notice, updates order status to completed
6. Node is published

Case two (users pay and do not come back to website)
1. User creates a pay to publish node
2. Node added to shopping cart
3. User goes to Paypal and makes payment
4. User closes browser or leaves paypal and doesn't come back to website
5. Website receives IPN notice, updates order status to completed
6. Node is not published

Thanks in advance for your help