Why does only some of the function get executed?

Hello, so basicly i have a gun script that u can hold down to shoot or simply press once to shoot once, it kinda works except it only runs the ray if u hold down and have shot 1 bullet before for some reason? its the same for the bullet that is supposed to fly out of the gun. the rest of the function gets executed perfectly. I cant figure it out and have tried for many hours now so would be very nice to get some help :)

Shooting = false

GunData = require(game.ReplicatedStorage.GunData)
TestGunData = GunData.TestGun

GunDMG = TestGunData[1]
GunRLT = TestGunData[2]
GunRPM = TestGunData[3]
GunMA  = TestGunData[4]
Auto   = TestGunData[5]
BType  = TestGunData[6]

CurrentBullets = game.ReplicatedStorage[player.Name].CurrentAmmo
BulletModel = game.ReplicatedStorage.Bullets[BType]

Muzzle = weapon.Muzzle
MuzzleFlash = weapon.MuzzleFlash

RecoilGoal = {}
RecoilTweenInfo = TweenInfo.new(0.05, Enum.EasingStyle.Linear)

function ShootOnce()
	print("ShootOnce called")
	local BulletRay = Ray.new(weapon.Muzzle.Position, game.Workspace.CurrentCamera.CFrame.LookVector * TestGunData[9])
	if BulletRay then
		print("There is a bullet ray", weapon.Muzzle.Position)
	end
	local hitPart, hitPosition = workspace:FindPartOnRayWithIgnoreList(BulletRay, {workspace.PlayerWeapons[player.Name], player.Character, workspace.DebrisBulletHoles})
	if hitPart then
		print("The ray touched something")
		local NewBulletHole = Instance.new("Part", game.Workspace.DebrisBulletHoles)
		NewBulletHole.Name = "BulletHole"
		NewBulletHole.Anchored = true
		NewBulletHole.CanCollide = false
		NewBulletHole.Position = hitPosition
		NewBulletHole.Size = Vector3.new(1, 1, 1)
		Debris:AddItem(NewBulletHole, 5)
	end
	CurrentBullets.Value = CurrentBullets.Value - 1
	Muzzle.MuzzleFlashLight.Enabled = true
	--MuzzleFlash.CFrame = Muzzle.CFrame * CFrame.new(1, 0, 0)
	--MuzzleFlash.Orientation = Vector3.new(math.random(0, 90), 0, 0)--MuzzleFlash.CFrame * CFrame.Angles(0, 0, math.rad(math.random(0, 90)))
	MuzzleFlash.FlashImage.Transparency = 0
	local clonedBullet = BulletModel:Clone()
	clonedBullet.Parent = workspace.DebrisBullets
	clonedBullet.CFrame = weapon.BulletPart.CFrame
	clonedBullet.BodyThrust.Force = Vector3.new(0, 0, -400)
	if Aiming then
		joint.C0 = TestGunData[8] * CFrame.new(1, 0, 0)
	else
		joint.C0 = TestGunData[7] * CFrame.new(1, 0, 0)
	end
	wait(0.01)
	if Aiming then
		RecoilGoal.C0 = TestGunData[8]
	else
		RecoilGoal.C0 = TestGunData[7]
	end
	local RecoilTween = TS:Create(joint, RecoilTweenInfo, RecoilGoal)
	RecoilTween:Play()
	clonedBullet.BodyThrust.Force = Vector3.new(0, 0, 0)
	Muzzle.MuzzleFlashLight.Enabled = false
	MuzzleFlash.FlashImage.Transparency = 1
	Debris:AddItem(clonedBullet, 2)
end

function StartShooting() -- Shoot function to start fire bullets
	if CurrentBullets.Value > 0 then
		if Auto == false and not Shooting then
			Shooting = true
			ShootOnce()
			wait(60/GunRPM)
			Shooting = false
		elseif Auto == true then
			while Shooting == true and CurrentBullets.Value > 0 do
				ShootOnce()
				wait(60/GunRPM)
			end
		end
	end
end

UIS.InputBegan:Connect(function(input)
	if input.UserInputType == Enum.UserInputType.MouseButton1 then
		if Reloading == false then
			Shooting = true
			StartShooting()
		end
	end
end)

UIS.InputEnded:Connect(function(input)
	if input.UserInputType == Enum.UserInputType.MouseButton1 then
		Shooting = false
	end
end)

if needed, here is the WHOLE script

UIS = game:GetService("UserInputService")
TS = game:GetService("TweenService")
Debris = game:GetService("Debris")

camera = game.Workspace.CurrentCamera
humanoid = game.Players.LocalPlayer.CharacterAdded:Wait():WaitForChild("Humanoid")
player = game.Players.LocalPlayer

Aiming = false

--Set the mouse cursor
UIS.MouseIconEnabled = false

--[[mouse = player:GetMouse()
mouse.Icon = ""]]

viewModel = game.ReplicatedStorage:WaitForChild("viewModel"):Clone()

function onDied()
	viewModel.Parent = nil
end

function onUpdate(dt)
	viewModel.Head.CFrame = camera.CFrame
end

humanoid.Died:Connect(onDied)
game:GetService("RunService").RenderStepped:Connect(onUpdate)

--Attach weapon to the viewModel
local repWeapon = game.ReplicatedStorage:WaitForChild("TestGun")
local weapon = repWeapon:Clone()

weapon.Parent = viewModel
viewModel.Parent = workspace.PlayerWeapons:WaitForChild(player.Name)

local joint = Instance.new("Motor6D")
joint.C0 = CFrame.new(1, -1.5, -2) * CFrame.Angles(0, math.rad(270), 0)
joint.Part0 = viewModel.Head
joint.Part1 = weapon.Handle
joint.Parent = viewModel.Head

--Tween For Aiming
AimTweenInfo = TweenInfo.new(0.25, Enum.EasingStyle.Linear)
Goal = {}

--Start Aiming
function StartAiming()
	Goal.C0 = TestGunData[8]
	local StartAimingTween = TS:Create(joint, AimTweenInfo, Goal)
	StartAimingTween:Play()
	Aiming = true
	--joint.C0 = CFrame.new(0, -1.25, 0) * CFrame.Angles(0, math.rad(270), 0)
end

UIS.InputBegan:Connect(function(input)
	if input.UserInputType == Enum.UserInputType.MouseButton2 then
		StartAiming()
	end
end)

--Stop Aiming
function StopAiming()
	Goal.C0 = TestGunData[7]
	local StopAimingTween = TS:Create(joint, AimTweenInfo, Goal)
	StopAimingTween:Play()
	Aiming = false
	--joint.C0 = CFrame.new(1, -1.5, -2) * CFrame.Angles(0, math.rad(270), 0)
end

UIS.InputEnded:Connect(function(input)
	if input.UserInputType == Enum.UserInputType.MouseButton2 then
		StopAiming()
	end
end)

--Toggle Aim
UIS.InputBegan:Connect(function(input)
	if input.KeyCode == Enum.KeyCode.Q then
		if Aiming then
			StopAiming()
		else
			StartAiming()
		end
	end
end)

-- Shoot
Shooting = false

GunData = require(game.ReplicatedStorage.GunData)
TestGunData = GunData.TestGun

GunDMG = TestGunData[1]
GunRLT = TestGunData[2]
GunRPM = TestGunData[3]
GunMA  = TestGunData[4]
Auto   = TestGunData[5]
BType  = TestGunData[6]

CurrentBullets = game.ReplicatedStorage[player.Name].CurrentAmmo
BulletModel = game.ReplicatedStorage.Bullets[BType]

Muzzle = weapon.Muzzle
MuzzleFlash = weapon.MuzzleFlash

RecoilGoal = {}
RecoilTweenInfo = TweenInfo.new(0.05, Enum.EasingStyle.Linear)

function ShootOnce()
	print("ShootOnce called")
	local BulletRay = Ray.new(weapon.Muzzle.Position, game.Workspace.CurrentCamera.CFrame.LookVector * TestGunData[9])
	if BulletRay then
		print("There is a bullet ray", weapon.Muzzle.Position)
	end
	local hitPart, hitPosition = workspace:FindPartOnRayWithIgnoreList(BulletRay, {workspace.PlayerWeapons[player.Name], player.Character, workspace.DebrisBulletHoles})
	if hitPart then
		print("The ray touched something")
		local NewBulletHole = Instance.new("Part", game.Workspace.DebrisBulletHoles)
		NewBulletHole.Name = "BulletHole"
		NewBulletHole.Anchored = true
		NewBulletHole.CanCollide = false
		NewBulletHole.Position = hitPosition
		NewBulletHole.Size = Vector3.new(1, 1, 1)
		Debris:AddItem(NewBulletHole, 5)
	end
	CurrentBullets.Value = CurrentBullets.Value - 1
	Muzzle.MuzzleFlashLight.Enabled = true
	--MuzzleFlash.CFrame = Muzzle.CFrame * CFrame.new(1, 0, 0)
	--MuzzleFlash.Orientation = Vector3.new(math.random(0, 90), 0, 0)--MuzzleFlash.CFrame * CFrame.Angles(0, 0, math.rad(math.random(0, 90)))
	MuzzleFlash.FlashImage.Transparency = 0
	local clonedBullet = BulletModel:Clone()
	clonedBullet.Parent = workspace.DebrisBullets
	clonedBullet.CFrame = weapon.BulletPart.CFrame
	clonedBullet.BodyThrust.Force = Vector3.new(0, 0, -400)
	if Aiming then
		joint.C0 = TestGunData[8] * CFrame.new(1, 0, 0)
	else
		joint.C0 = TestGunData[7] * CFrame.new(1, 0, 0)
	end
	wait(0.01)
	if Aiming then
		RecoilGoal.C0 = TestGunData[8]
	else
		RecoilGoal.C0 = TestGunData[7]
	end
	local RecoilTween = TS:Create(joint, RecoilTweenInfo, RecoilGoal)
	RecoilTween:Play()
	clonedBullet.BodyThrust.Force = Vector3.new(0, 0, 0)
	Muzzle.MuzzleFlashLight.Enabled = false
	MuzzleFlash.FlashImage.Transparency = 1
	Debris:AddItem(clonedBullet, 2)
end

function StartShooting() -- Shoot function to start fire bullets
	if CurrentBullets.Value > 0 then
		if Auto == false and not Shooting then
			Shooting = true
			ShootOnce()
			wait(60/GunRPM)
			Shooting = false
		elseif Auto == true then
			while Shooting == true and CurrentBullets.Value > 0 do
				ShootOnce()
				wait(60/GunRPM)
			end
		end
	end
end

UIS.InputBegan:Connect(function(input)
	if input.UserInputType == Enum.UserInputType.MouseButton1 then
		if Reloading == false then
			Shooting = true
			StartShooting()
		end
	end
end)

UIS.InputEnded:Connect(function(input)
	if input.UserInputType == Enum.UserInputType.MouseButton1 then
		Shooting = false
	end
end)

-- Reload
Reloading = false
function Reload()
	Reloading = true
	wait(GunRLT)
	CurrentBullets.Value = GunMA
	Reloading = false
end

UIS.InputBegan:Connect(function(input)
	if input.KeyCode == Enum.KeyCode.R then
		if CurrentBullets.Value < GunMA and Reloading == false and Shooting == false then
			Reload()
		end
	end
end)