Playing as Ungrim Ironfist, the Karak Ungor map seems to have some issue, especially with the AI. They tend to rush one by one on the open side with the bridge and get totally destroyed by the balista/tower that cover that area.

The other entrance, the walled one with the gate seems to cause issue with the AI getting stuck in the left part of the wall, same for my unit when fighting these bugged invaders, some of the unit from the regiment get stucked there all game long and cause some weird pathing issue where the regiment always try to get back on the wall.

https://steamcommunity.com/sharedfiles/filedetails/?id=1470439475

In this one you can see one of the tower who landed right in the tower area and there was a regiment stucked there, inside the wall. As for the tower to the left on this picture, there is also a regiment stuck in the tower that I can't even attack.

Same thing happens whe they try to climb with ladders, they go right into the tower and always get stuck there.

https://steamcommunity.com/sharedfiles/filedetails/?id=1470439502

This one show some of the unit of a miner regiment stuck there as well, I still have control of the regiment, but having these 10 or so miners stuck there always force the regiment to come back on the wall. You can also see some goblins stuck uin the tower there.

I did many siege attack and defense there during the campaign and it seems that thwere is always something weird happening with that walled side.