[ANSWERED]How do I stop my gun from shooting more than one bullet?

So the problem with the gun is, it works fine the first time a player equips it, but once it's unequipped and reequipped, the gun shoots 2 bullets at once, and once it's unequipped and reequipped again, it will shoot 3 bullets, and so on. How do I stop this?

Here's my localscript inside the gun:

local maxAmmo = 12
local ammo = maxAmmo
local reloading = false
local player = game.Players.LocalPlayer
local playerGui = player:WaitForChild("PlayerGui")
local textLabel = playerGui:WaitForChild("Ammo"):FindFirstChild("AmmoCount")
local InRound = game.ReplicatedStorage.InRound
local ammoCount = game.Players.LocalPlayer.PlayerGui.Ammo.AmmoCount
local cursorId = "http://www.roblox.com/asset/?id=117431027"
local mouse = game.Players.LocalPlayer:GetMouse()
local team = game:GetService("Teams")
local leftButtonDown 

function onUnequipped()
	leftButtonDown = false
	reloading = false
	ammoCount.Visible = false
	mouse.Icon = ""
end

local function reload()
	reloading = true
	script.Parent.Reload:Play()
	wait(3)
	ammo = maxAmmo
	reloading = false
end

local function onFire()
	if leftButtonDown and ammo > 0 and not reloading and InRound.Value then
		ammo = ammo - 1
		script.Parent.GunShot:Play()
		local name = mouse.Target.Parent.Name
		if mouse.Target.Parent:FindFirstChild("Humanoid") and InRound.Value and game.Players.name.team ~= player.team then
			print(player.team)
			print(game.Players.name.team)
			script.Parent.dealDmg:FireServer(mouse.Target.Parent, 18.5)
		end
	elseif not reloading then
		reload()
		script.Parent.GunShot:Stop()
	end
	while wait() do
		textLabel.Text = (ammo).." / "..maxAmmo
	end
end

local function onMouseDown()
	leftButtonDown = true
	onFire()
end
local function onMouseUp()
	leftButtonDown = false
end



script.Parent.Equipped:Connect(function()
	mouse.Icon = cursorId
	ammoCount.Visible = true
	
	mouse.Button1Down:Connect(onMouseDown)
	mouse.Button1Up:Connect(onMouseUp)
	
	local input = game:GetService("UserInputService")
	input.InputBegan:Connect(function(Key)
		if Key.KeyCode == Enum.KeyCode.R and not reloading and ammo ~= maxAmmo then
			reload()
		end
	end)
end)

script.Parent.Unequipped:Connect(onUnequipped)

And here's my server script inside the gun:

function tagHumanoid(humanoid, player)
	local creator = Instance.new("ObjectValue")
	creator.Value = player
	creator.Name = "creator"
	creator.Parent = humanoid
end

function untagHumanoid(humanoid)
	if humanoid ~= nil then
		local tag = humanoid:FindFirstChild("creator")
		if tag ~= nil then
			tag.Parent = nil
		end
	end
end

script.Parent.dealDmg.OnServerEvent:Connect(function(player, Target, Damage)
	local humanoid = Target.Humanoid
	tagHumanoid(humanoid, player)
	humanoid:TakeDamage(Damage)
	wait(1)
	untagHumanoid(humanoid)
end)

Question has been answered by TimScript on Discord. I simply had to take out this part:

 mouse.Button1Down:Connect(onMouseDown)
    mouse.Button1Up:Connect(onMouseUp)

    local input = game:GetService("UserInputService")
    input.InputBegan:Connect(function(Key)
        if Key.KeyCode == Enum.KeyCode.R and not reloading and ammo ~= maxAmmo then
            reload()
        end
    end)

and put it outside the script.Parent.Equipped so it wouldn't be called every time the gun was equipped. I also had to add an equipped variable and added an if statement to the onMouseDown() function to make sure it only fire if the tool is equipped.