shooting npcs not as fun anymore please help

new here, garrysmod is awesome, especially when you shoot a npc in the face! normally, if you shoot a npc with a high power gun they go flying back right? well suddenly everytime i shoot an npc they just fall straight down where they stand. ill duck and aim right at their head but even then, they just seem to “fold” down the the ground. does anyone know how to fix this?

Try unchecking keep corpses might work but im not sure