need help

i got 2 questions 1.i have a zombie survival server and the zombies doesnt hurt when they hit… but the headcrabs does how do i make all zombies hurt?? 2.everyone can spawn like airboats and jeeps whats the command to make so admin only can spawn it?
sorry for my bad english -.-

Im fairly sure the gamemode your using is broken, you could check the code, but that would be tedious.

sbox_maxvehicles 0 or something
Or get a admin mod