Can’t add players to sets

I have been collecting the fresh faces and other cards to add to sets. I have all the cards for multiple sets but it won’t let me add them. They are sitting in y binder, not in my lineup. If you try to add to a set from the binder it says that it does not belong to any sets. If I try to add it from the set it just searches auctions. The only card I’ve been able to add at all is Chavez Brown, which I now have 4 of!