I have created a new collection, but when I want to see the collection, I can't see any product, and the page show me that the collection is empty. I don't understand why, because when I set up the conditions, shopify shows me the products that match with the conditions.
But this only happen when I set a specific tag, do you know what is the problem?
I can see one product if I follow your link. Are you sure your products all published/active? Plus your product filtering App -- is it working properly?