In the last few days, I've had Maleria ask me to bring her a Black Sai (one just by itself and once with another weapon), and I know for sure that it was in my inventory both times before I click that I have all the items, but when I try to finish the quest it leads me to an error page (the one with the squirrel on it? I didn't screenshot it last time it happened unfortunately). When I get back to the quest page and try to once again complete the quest, I'm told that I don't have all the items she asked for, and both times it was the Black Sai that disappeared while the other weapon she asked for was in my inventory still. I didn't think much of it the first time, but having it happen again with the same weapon made me think it's a bug with the Black Sai for Maleria's Quests. Not a big deal since it's not an expensive item, but a bug nonetheless.