Adding games to your "lists"

Hey all, I seem to have a problem adding certain games to some of my lists... For example, when I go to add Killzone 2 to my Wishlist, it is grayed out, and I only have the option of adding it to a custom list or my Favorites.  Anybody else get this problem with some games?  Killzone 2 isn't the only game I've had it with, I get it with lots of others as well, though its not always Wishlist that is grayed out (sometimes it is favorites, sometimes My Collection).  Anyways, any incite into this problem would be awesome!

They're assuming nobody wants Killzone 2, so you can't add it.

Whoops I think this shoulda been posted in the Editing and Tools forum, didn't see it when I made the topic!

"They're assuming nobody wants Killzone 2, so you can't add it.
"

"They're assuming nobody wants Killzone 2, so you can't add it.
"