Kagain quest broken? minor spoilers

I grab Kagain in Beregost, and the quest to look for Entar's son goes into my journal. I go north to the Caravan location, Kagain gives some speech how he has lost interest in the quest upon entering the area (the quest also stay in my journal . i did this quest many years ago and i remember there was a dead body there for kagain to inspect to continue the quest but it is gone now, but the dead body was there when i first entered that location before i meet kagain. i was not sure if this was a bug so i started agian and when to get kagain before i went through the location with the caravan and it still did not work even when the bodys were there kagian also gives the same speech when entering the location.

any help would be much appreciated