Fix cart hyperlinks in Opencart site.

We have an Opencart V2.3.0.2 website that use Journal2 theme and a plugin called Pitchprint. Pitchprint generates a design online and returns a unique ID code to Opencart for each one, clients can generate more than one custom design per product in Opencart, IE they can select the round template and create a red, green and blue design. The problem is that the hyperlinks in Opencarts mini-cart, cart and checkout will only link back to the last design made for any given product. We want this modified so that the hyperlinks for each product custom design will link back to that particular design. Function can be seen at [login to view URL] this is our dev site and is running correctly except for the cart/checkout item hyperlinks, you can create your own items as a guest and see the issue first hand. We would require the mod to be a VQmod so we can upload it to our live site when ready.