If the random mineshaft quest involves Urdlenites and Dire Moles, the gnomes and the moles will be hostile toward each other.
Quote from: "One Urdlenite to another"Devooooour everythiiiiing! *charges*
Strikes me as plausible scenario!
Perhaps this isn't a bug, but a potential update for certain shared-faith easter egg?
It is in fact a bug, now fixed.