Yeah, I found this bug years ago (if it's the same one) where the fillcan would break the player's face.
I asked about it and []---[] gave me a fix that I uploaded to RTB, which is also why I was credited with ownership over the Fillcan on RTB.
Check your Fillcan's description.txt. If it doesn't say:
Title: Fill can
Author: Zor, Ported by Hit man, fixed by []----[]
Instant flood-fill painting.
(Player Face ERROR: Fixed)
then it's prolly to blame.
RTB is was obviously taken down, but I still have a patched copy of the mod if you don't have it.
https://puu.sh/BNZEp/f29b9953ad.zip