[My Marketplace Store - Demos & Full Version Mixed]

Yes, that makes sense, I agree however, when I go into my store (no price search selected) I see a mishmash of items being offered for sale (demos and full version items mixed)... other stores don't have their items appearing like that. 

[My Marketplace Store - Demos & Full Version Mixed]

I am new as a merchant to Marketplace and have successfully uploaded a few items however, when I visit my store the demos are all mixed in with the full version items for sale. Other stores have their full version items listed on their beginning pages and their demos appear on the last pages. The two categories are not mixed together.  When I initially uploaded my content, I transferred each item (full version item folder and demo item folder) directly from my inventory to the Marketplace Listings Window then created the listing for each.  Have I done something incorrectly, if so... how can I fix it? TIA for your help.