How do you make a filter enabling damage script?

This is the damage script I want the player to take damage but it does take damage however, I test it in game and the player did take damage but when I print the health. It's the same as the maxHealth this means the player took damage on a client but not on the server. How could I make the player take damage on the server?

local damage = staff.Touched:connect(function(h)
local tag = h.Parent
if impact == true then
impact = false
hitsound:Play()
end
if tag:findFirstChild("HumanoidRootPart") then
if tag:findFirstChild("Pvp") and tag.Name == (script.Parent.track.targeting.Value).Name then
if tag.Pvp.Value == true then
if tag:findFirstChild("Humanoid") then
tag.Humanoid.Health = tag.Humanoid.Health -5
if tag.HumanoidRootPart:findFirstChild("BodyVelocity") then
else
local bv = Instance.new("BodyVelocity", tag.HumanoidRootPart)
bv.MaxForce = Vector3.new(math.huge,math.huge,math.huge)
bv.Velocity = char.HumanoidRootPart.CFrame.lookVector *75
end
if tag.HumanoidRootPart:findFirstChild("shock") then
tag.HumanoidRootPart.shock:Destroy()
end
if tag.HumanoidRootPart:findFirstChild("shock") then
tracking.HumanoidRootPart.shock:Destroy()
else
local shock = game.Lighting.Guns.LaserBo.shock:Clone()
shock.Parent = tracking.HumanoidRootPart
end
if tag.HumanoidRootPart:findFirstChild("shocklight") then
else
local shock = game.Lighting.Guns.LaserBo.shock:Clone()
shock.Parent = tracking.HumanoidRootPart
end
wait(0.25)
if tag.HumanoidRootPart:findFirstChild("BodyVelocity") then
tag.HumanoidRootPart:findFirstChild("BodyVelocity"):Destroy()
end
if tag.HumanoidRootPart:findFirstChild("shock") then
tracking.HumanoidRootPart.shock:Destroy()
end
if tag.HumanoidRootPart:findFirstChild("shocklight") then
tag.HumanoidRootPart:findFirstChild("shocklight"):Destroy()
end
end
if tag:findFirstChild("Target") then
if tag.Name == player.Name then
else
tag.Target.Health = tag.Target.Health -5
if tag.HumanoidRootPart:findFirstChild("shock") then
tag.HumanoidRootPart.shock:Destroy()
end
if tag.HumanoidRootPart:findFirstChild("BodyVelocity") then
>
>else
local bv = Instance.new("BodyVelocity", tag.HumanoidRootPart)
bv.MaxForce = Vector3.new(math.huge,math.huge,math.huge)
bv.Velocity = char.HumanoidRootPart.CFrame.lookVector *75
end
if tag.HumanoidRootPart:findFirstChild("shock") then
tracking.HumanoidRootPart.shock:Destroy()
else
local shock = game.Lighting.Guns.LaserBo.shock:Clone()
shock.Parent = tracking.HumanoidRootPart
end
if tag.HumanoidRootPart:findFirstChild("shocklight") then
else
local shock = game.Lighting.Guns.LaserBo.shock:Clone()
shock.Parent = tracking.HumanoidRootPart
end
wait(0.25)
if tag.HumanoidRootPart:findFirstChild("BodyVelocity") then
tag.HumanoidRootPart:findFirstChild("BodyVelocity"):Destroy()
end
if tag.HumanoidRootPart:findFirstChild("shock") then
tracking.HumanoidRootPart.shock:Destroy()
end
if tag.HumanoidRootPart:findFirstChild("shocklight") then
tag.HumanoidRootPart:findFirstChild("shocklight"):Destroy()
end
end
end
end
end
end
end)