I've noticed that some of my scrolls disappear when clicked on, whether it was used or not. I'm not sure if this has already been reported, but it's an irritating bug. For instance, if I click a fireball scroll but change my mind and right-click/cancel out of it (like canceling a spell), the scroll will still disappear as if it's been used. After the tactical battle, it'll be gone as well. I've only noticed it with scrolls, but I'm now veeery carefully deciding when I want to use scrolls.