@seismicsquall idk specifically for this one, but lots of US versions have some kind of censorship, grey blood and the likes.

@surrogate01 splatterhouse is not part of the FBA romset, so it won't work in FBA.

it is, however, part of the mame2003 0.78 romset and works. HOWEVER there was a bug fixed in it mid last year, so if you did a full update for 4.0 you should have the fix.