Hmm a few problems:
1. This shortcode: [dpsc_display_product category="1"]
-It does not go into the page where you want the grid displayed, it goes into the actual product post. i.e. if one of your products is a ball, thats where this goes - it allows the "add to cart", "price" and images to be seen for each product. You would thus need it it present for each and every product in your store.
-It also has no variables attached to is, it should just be "[dpsc_display_product]"
2. This shortcode: [dpsc_grid_display category=”2” total="13" column="3" per_page="4"]
Your use of this is super fine. Just make sure the category id (in your case "2") is the category in which you filed all the posts that represent your products.
We updated our documentation covering short codes, perhaps it will be more useful: http://dukapress.org/docs/short-codes/
We apologise for our previously shallow documentation. :(
Also, please ensure you have only one DukaPress shortcode inside any one page/post.