Zombies dont do damage

the zombies (all kinds) attack me but they do no damage and occasionally go right through me. Can anybody help me?
I fixed it. Just cleaned out Garrys Mod

Same thing happens to me

The same thing happens to me.

I think it could be an addon or the player model you’re using. I know the Barney model is pretty FUBARed. Otherwise, it could be a problem in the coding of the zombies.

Sorry, not much help, but I don’t really understand it myself.