There's negative rep from all the early quests in the Abandoned Temple of Baa, even killing the Spider Queen and rescuing Angela. I would expect -ve rep from retrieving the candelabra, but -ve rep from the other two really doesn't make much sense. A possible explanation is that the whole place is contaminated with evil and some "rubs off". However, that's not consistent with the large rep increase from retrieving from the Superior Temple of Baa the letter which blows the whistle on Slicker Silvertongue.It really doesn't make sense, but that's how it is. *shrug*