Product Selection does not “save” on each step

Hello,

On my site – sculptedtech.com – I have used Product Builders for the “Custom PC” part. But when users select a product for each steps, it doesn’t go through. For example, my first step is to select a case, the user will select a case and then the page will automatically move on to the next step, which is selecting a motherboard. But the case that they user selected in the first step doesn’t show up in the “Case Selection” portion or in the cart when they finish all the steps.