I think Monipupi and I were traveling the same collision course! Today, after wasting hours and hours with the same issue (item not showing up in the collection list as well as the Collection title not showing up on the product page) and after checking and re-checking the Auto / Page Title criteria, I sat staring at the product page in defeat. And then, there it was, glaring out from the Product Title ..one little character, a letter “s” ..making a word plural when it’s not. So there ya have it, in literally 2 seconds all those hours of frustration came to an end. Just goes to show, the fix can never be too minute.