Half-Ogres Near Beregost Fix?

Is there any way to fix this quest if it becomes bugged or should I just ignore the quest? I killed all the half-ogres and have scoured the entire map with no enemies left, but Bjornin just keeps asking me if I've dealt with them yet.
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so if you didn't see him you weren't in the right area
I do remember using Cleric Evil Turn Undead to control some skeletons in that fight. If one of the skeletons killed a half-ogre, would that break the quest?
that is actually quite possible
although sometimes as well, those ogres will move around the map to, so perhaps one of them was on the move while you were exploring the map?
worse case scenario bjornin only gives 400 XP, +1 REP ( which there are plently of REP ups in the game ) and a medium shield +1 that you can pick pocket off of him if your score is 50% or higher
The only problem I've ever had with is is as Sarevok says, they wander around quite a lot so it's not unusual to find only 3 of them together and an elusive 4th half ogre wandering around somewhere nearby.
Usually I talk to Bjornin on my first visit to Beregost when heading down to Nashkel, and depending upon party composition (i.e. if I have Kivan with his timer running) I'll sometimes wait until after I've cleared the bandit camp before I kill those half ogres and I've never had any problems turning it in once I've killed all 4 so I'm not convinced there is a time related bug.