NPC Bodies Disappear! Why?

I have a problem with gmod 13 i have keep corpses checked, but after a while they disappear and ive checked all the options in the console, does anyone know whats wrong?!
maybe its an addon, but im trying to avoid removing them all before i know what the problem is for sure. PLEASE HELP!

NPC Groups V5 does this. Type npcg in the console, and if you see any command pop up about “ragdoll fadetime”, that’s your answer. There’s also an NPC spawner tool available with a “Clean up corpses” option. Uncheck it, if you have any NPC Tools installed.

If none of this works, try reinstalling.