If bringing more than one guar at the same time to Nassuran Omoril or Seresa Maanith during the quest "Stray Caravan Guars", the quest giver will only give the reward for one guar. To get the reward for the second guar, one needs to exit the dialogue and revisit the topic, making it easy to miss it. It would be much more convenient if one would get the combined for all guars at once, although I guess this might not be very easy to implement.