weird bug whenever i reload my gun?

https://www.youtube.com/watch?v=f4wZ5Lvbw28&feature=youtu.be

Shooting script:

while wait() do
    if mouseDown then
if Ammo>0 and not Reloading then
  Ammo=Ammo-1
	local gunfire = script.Parent:FindFirstChild("Gunfire")
	gunfire:Play()
	RecoilAnimation:Play()
	wait(0.1)
	script.Parent.FireEvent:FireServer(Mouse.Target.Parent, script.Parent:FindFirstChild("Damage").Value)
	elseif Ammo == 0 and not Reloading then
	local EmptyClip = script.Parent:FindFirstChild("EmptyClip")
	EmptyClip:Play()
	wait(0.4)
    else
        
    end
end