Yeah, that's weird. Never seen that before. I have no idea what could be causing it?!
Does it happen when you load up vanilla game/no mods?
Make backups of current 'update.rpf', 'common.rpf' & 'x64h.rpf' 'mods' folder archives & then replace them with vanilla versions from the game folder. See if any change in-game?
To rule out all other '.rpf's you should also test your vanilla game/no mods & see if it happens there too.