Bug(?) With handgunners

When in battle my handgunners have strange behavior. They don't start shooting automatically at enemies in their range, if I manually order them, they start to run to the enemy as if they are trying to go melee. After that they behave normally. It's a good thing I'm fighting other provinces now, but when beastmen show up I'm sure there won't be time for these shenanigans. Crossbowmen behave normally. If it helps, I turn off autoretreat