Comersus E-Commerce Shopping Cart Bug Fix

A client of mine customized the Comersus E-Commerce software and is having a few bugs. There are several bugs and upgrades to do and whoever successfully completes this first one will likely be given the others to do. This first bug is simple. They added a Product Wizard to make the process of adding a product simpler for their client and they changed the image upload process so that it created multiple sizes of the uploaded image. The problem is that after a product is added to the cart the larger of the three image sizes is shown when in fact the smallest image should be displayed. This job would be to fix that bug. My client cannot no I outsourced this project. I will be an intermediary between the programmer and my client.