bombard targetting
Bombard targetting is buggy. To see it make a new map, place an empire bombard on a tile surrounded by chasm tiles, place your melee units and make them run around the bombard. Some of its shots will be way off.
Could be the same bug as this.
Cian Noonan as discussed, the optimization you made got rid of an important bone allowing the rotation of the bombard.
Can you expose it again and don't forget to tag the gameobject with Rotatable tag. Cheers