New Post: Product Detail Not displaying

I'm working on upgrading one of my sites.
Previously, I just used the product list, and didn't have it click to the product detail. I had the buy button on the product list.
I'm now changing this, but when the products are being displayed, when I click on the product the url changes to the product, but the list displays.
I've definitely got the correct templates defined in the module settings, but I'm suspecting there may be something else somewhere.
Any ideas?