Cannot group my deck's cards into categories

{"ops":[{"insert":"I just imported a precon which I want to upgrade. I have tried to get it to group into categories, which I have done many times with other decks, but this time it won't. Just keeps it on \"type.\" It will group into mana cost, but not categories or multiple categories. I don't think I've done anything different, except that the page that comes up when you click on \"new deck\" seems different.\n"}]}