This may or may not be a bug but I couldn't find any relevant information pertaining to it. Upon failure of the pickpocket action you take a bluff check, it was my assumption that this was to decide whether or not you are detected. However when I suceeded at the check all the pcs nearby were nonetheless alerted. Furthermore the actual pickpocket check did not appear though that roll may be hidden?
Character: Vargrimst Kharzadan