EDIT:Problem solved thanks to Hunterdnrc. thank you Hunterdnrc
after download the machinima model pack of garrysmod.org, all of my ragdolls were like this…
After I deleted it, all of my ragdolls were fine except for my Left 4 dead ragdolls which look like this. I am still able to pick them up by an invisible area around their feet, walk in to them for 1 second then walk through them.
I belive that there is a direct correlation between the one killing floor survivor ragdoll from the machinima pack and the survivors from the left 4 dead folder. But I have no idea
If anyone has had a problem similar to this and knows how to help, it would be amazing if you could tell me. I have been trying to figure this thing out for 2 months now with no luck at all. The reason why I post this in the model section is because the similarities with the stances of the l4d models in game to how a model would look in sdk or any 3d modeling program.