I'm pretty sure the Dragon familiars are fine. I remember them torching me on occasion. Well... trying to, at least ;P
It's definitely the bats. In Schloss Alder's "sewer-y" section, several bat enemies reside there naturally. They still transform.
Also, in the big round room in Alder, I think one of the textures on the outside wall is misaligned vertically (it's underneath an arch, I believe). Nothing major... it wasn't a secret area, either.

EDIT: I checked the bat's decorate and I diagnosed the problem. Apparently, in order to prevent infighting I presume, both familiars' definitions inherit from ImpWarlord and uses SKIP_SUPER (for the layperson: SKIP_SUPER causes the actor to inherit *only* states, no flags or properties). However, this poses a problem as the bat familiar has no Missile states. Why, you ask?
A_Chase naturally calls the actor's Missile state at random intervals, and normally if a monster does not have them, this action is skipped (thus why demons don't randomly bite thin air ;P). Normally this would work fine in the bat's case, but the problem is that thanks to inheritance, the weapon *does* have a Missile state, left-over from the Imp Warlord. So, when the bat decides to use an attack, it sees the ImpWarlord's missile states, thinks they are its own, and runs them. All of a sudden, you have a tiny, floating Warlord throwing death skulls at you.

(Also note that this is why the dragon works fine. Unlike the bat, it defines its Missile states so it doesn't wind up using the Warlord's).
So, how to fix this? The easiest way would be to remove the inheritance but I'm sure that without it, the bats are prone to attack their masters (I've seen it happen in Zen Dynamics, 'tis why). I would propose adding a simple "empty" Missile state consisting of a 0-length frame and a jump back to the See state, but that would result in jerky animation... if Frame B decides to call the Missile state, it will wind up jumping straight back to Frame A... skipping over C and B again.
Sadly, I can't seem to find what I'm looking for on the wiki. Does anyone know if it's possible to completely clear a certain set of states? I know it used to be possible, but this was deprecated IIRC and doesn't work now. I'm slightly stumped on this one... unless it's possible to clear the states, we'll either have to settle for a jerky animation or run the risk of spawned bats turning against their creators. Either way, not an optimal solution.
Decorate gurus, let us unite and slay this menace of a problem!