I have a bunch of cards floating in my org that are not in any collection. If I put tags on and search for it there is no collection attached to them. Is it with all the cards? It is possible you "added" the entire set by accident and they are in what I'm calling ORG limbo like mine.
Building Base sets and Collecting All Tigers
Looking for 1951 Red Back #36 Gus Zernial JUST ONE MORE TO GO!!!!!!!