Invisibility cloak, Harry Potter And The Deathly Hollows question?

I'm on the fourth book, but saw the first part of the seventh movie. In the goblet of fire, the book says mr crouch had a invisibility cloak(to my knowledge he doesn't share the same one with harry). Why? Isn't there supposed to be only one since it's one of the deathly hollows? If I sound like a noob I'm sorry, I just started reading the books.