Update- Looks like the issue was fixed in most recent patch/es, so I was able to kill an ogre and advance adventure log. Thanks!

The Ogres near Mansha Forest/Lake Kaia are bugged.

Tried reloading game, tried different servers, and it made no difference.

I start fighting them and then while doing some damage, they just unaggro and reset their health back to full, so they can't be killed cuz I don't burn them down fast enough before they reset. I'm not drawing them away from their area or anything, I go to their area, and they'll unaggro even if I'm practically standing right on their feet while fighting them. I get in some hits and then it just stops fighting me, and health resets. Doesn't even go anywhere cuz it's still in their area, just unaggroes and health resets.

Anyway, this sucks because I can't progress this Adventure Log book until I kill one.

I saw somebody on reddit reported the same thing a while back but not everyone experenced it and it was never resolved.