Ok, so I'm thinking back to when I got dark below and house of wolves. I bought the dark below from the store like any other game or game add on. But, when the house of wolves dropped, I got on and there was a little tab to the right advertising the house like any other new thing so I clicked it and it just said install and I didn't think much of it at the time but it didn't have a price on it. It just said install. So I don't know if that's the problem, which it shouldn't be because I've never game shared, or it's just some kind of glitch.