i think it's really stupid question to ask but anyway, i made a map and the monsters are in the room that i made, so when i shoot only 1 monster all the monsters wake up to attack
i tried to hide the monsters and it's not helps

for example this wad http://www.doomworld.com/idgames/index.php?id=5508 is works fine, the all monsters not wake up to attack. but mine yes..