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.
I gave this a try with an Empire Bombard and Gnarlings but didn't see anything out of the ordinary. Were you using a specific type of unit? If I'm not mistaken Bombards are liable to miss a unit moving too fast.
Did notice a couple of unusual issues while testing though, for some reason the Bombard's VFX has become unsynced in the latest hotfix and they also occasionally have a delay before roughly 1 shot in every 20. I'll pass these through but welcome further replication steps for the ticketed issue.