I now have so many stacks of keys (9) in the Book Of Souls that I can no longer see new items.. there's no way to get to souls or even other keys because the view is limited to ONLY 9 items..
Something REALLY needs to be done to either increase the number of items which are visible or to move the keys OUT of the BOS or put them in another scrolling list separate from souls.
My ONLY option at this point to burn off stacks of keys so other items appear. Forfeiting earned items is a TERRIBLE solution to a bad UI.