Bizarre Monster Book Error

ok, but here's the dilemma with that: If it's displaying Leviathan as having 5 cards, and then I get a Leviathan card (even though I don't really have 5 leviathan), what happens?

Maybe it'll go to a different spot until you have the true 5th one on leviathan, and you even see it works or not. Tricky one. Or maybe the client discards it as you already have 5 client-wise.