Weird situation with MS / FPS.

[Arch-vile90]

Well I did not know where to post this, here or in general, i think this is an editing problem about my mod.

I encountered a really weird situation about MS / FPS after killing 60+ monsters into a water place.
Gore and blood have the +DONTSPLASH flag and monsters no but if i set this flag to the zombieman the situation does not change.

for those who wonder why a map with a density of monsters like to hong kong, the map is from the cool Dump ep1.

I need help in understanding the source of my problem.