If one goes to your store you can see the flag collection and that you have added 24 products to it.
If one clicks to view the collection, there are only 8 products available for browsing:
This is most likely because, as has already been explained to you, the other 16 products have been hidden as they need Optimization. You can read about what this means here. Optimizing a product can be as simple as changing one tag and clicking the button to reset it from Hidden to Public. You don't have to re-do the design or re-do the Collection or do anything at all with the Collection actually. Flagging products in this way is actually helpful as it alerts Creators to products that haven't gotten even a view in 15 months. You can then decide whether to "optimize it" and give it another 15 months, or delete it. You can refuse to optimize anything but you are only hurting yourself that way. The time spent emailing Zazzle every day would be better spent just reviewing & "optimizing" your products.
Your can find which products in a store have been hidden for optimization by going to your All Products back-end and selecting the"Optimization Needed" filter.
You can review all the products that need optimization on your 'products' tab in store management, and then by selecting the filter for optimization needed. As seen below.
By default, your Store Management Product view is set to 'newest to oldest', but you can change these filters to whichever you like and you will see a red triangle next to products that need optimization among your other, public products (if you don't use the above filter).
I believe this is because out-of-stock products are hidden to the public until they are back in stock and tissue paper is currently out-of-stock.
