I've posted about this bug a number of times, but have seen no response about it. However, I've just figured out the specific circumstances under which it happens.

When killing wolves for Sutton, if you kill a wolf with the very first hit, when you go to Sutton, he doesn't count that kill. For instance, with a thief, if I backstab and land an EVISERATE or a MUTILATE at the upper end and then go straight to Sutton after that kill, he doesn't pay me for it. However, if the backstab misses, or doesn't kill the wolf outright, and then I go to Sutton, he pays me for the kill. If you go through the area and kill all nine wolves, counting as you go and marking it down on paper, and 4 wolves died instantly and 5 took 2 hits or more, when you go to Sutton, he only pays you for five.

This bug has been annoying the crap out of me for a couple years now so I'm glad I finally figured it out.

n/t