eShop problems with posts WordPress

I trying to help a company with update a webshop solution for them. I selected eShop (http://quirm.net/eshop-2/) and I facing a problem:

http://www.dorianmagazine.com/shop/
> http://www.dorianmagazine.com/shop/subscribe/ - works perfect.
> http://www.dorianmagazine.com/shop/issues/ - will list all post with category "old-issues" and here is the problem.

The direct link: http://www.dorianmagazine.com/2011/22/dorian-magazine-issue-13/ to one of the posts works perfect. But when i trying to get a category page with older issues and add a "add to cart" i face this problem.

Any one that know why?

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