Custom Sidebars Pro not showing on all MarketPress pages

I created a Custom Sidebar named MarketPress and added the Shopping Cart and Product Categories widgets. Then on the Store page (auto-generated by MarketPress) I set the default sidebar to MarketPress in the sidebar metabox.

The MarketPress sidebar shows on /store page does not show on any of it's sub-pages like /products, /shopping-cart, order-status, etc.

I'm not sure what I'm doing wrong here...

Here is a link to the store of the site I'm developing: