I took the quest to slay dragons and on my way i wanted to see just what the quest was so i pressed the quest for additional information only to notice that the quest deleted itself and my only wand of starlight disappeared (expecting it back because of lack of info).
Note: Every deleting action should have a confirm button, also maybe add a different line of keying to delete a quest than a normal mouse click which would be the logic behaviour of any player when they want info on the quest.