My name is Alex, I'm a guru here at Shopify!
Thanks for reaching out! I think the issue here is the link that you're using in your navigation to view that collection:
This returns a collections page that has all of the tags noted there - so a product would only appear there if it had the tags hats, savage, lit, headwear, beanie, and roses applied to it. When you were adding that collection to your navigation, had you added any tags in the filter collection with tags section?
If so, I'd suggest removing those tags - once done, that page should populate with all the items you have in that collection!
Hope that's helped! Please feel free to let me know, and you can always give us a call or start a live chat at any time. We're open 24/7 for your convenience and always happy to assist!
Alex | Shopify Guru