Gmod Single Player Items Disappearing

Ok, so pretty much i am going into single player sandbox mode… and when i spawn npcs, weapons, ammo, props etc.
they disappear within 1-3 min of them being spawned. I don’t know why but they just completely remove from the map.
I was using badkings ammo placer and when i would do a count to see how many weapons are on the map it would say 8 and then when they disappear it would be 0…
so it’s obviously being removed from the sandbox for some reason. I would gladly appreciate the help!

I have tried deleting all addons and re installing gmod but no fix yet.