Products not showing up in collection page

Thanks for the insight. We did add this collection and contents manually from the beginning. We followed someone’s advise about reviewing Tags and sure enough when we deleted one and corrected a spelling error on another it corrected the collection problem. Why? I did not realize tags were so important on our end. I thought they were there mostly for customer search.

I plan to review other product tags to see if that is why they show up oddly in one collection but not another re: dress instead of dresses sort of thing.

Thanks for the info as moving forward I will watch