Uh.... Ill Try But That doesnt make any sense since how do weponds do damage on a Zombie Server >:)
Disable Rontondo's Zombie Mod for Wepon to work.
Because in Gamemode_Zombie there is an option labled "Friendly Fire". It disables weapon damage on players, but not on bots, so you can still kill zombies. You probably have Friendly Fire enabled, so you should disable it, or just disable Gamemode_Zombie all together, you should only have Add-Ons enabled that are relevant to the server.
that won't work, the option will still be in effectactualy, you need to enable friendly fire, not disable it