Weld Is Messing Up Fireball For Some Reason?

I'm creating a fireball and I'd like to create a second sphere around that fireball and weld it but for some reason when I add the second fireball it stops being smooth and it changes the starting position.

Here is my code so far

	local Character = player.Character
	
	local p = Instance.new("Part")
	p.Shape = "Ball"
	p.Size = Vector3.new(1,1,1)
	p.CanCollide = false
	p.Material = "Neon"
	p.CFrame = player.Character:FindFirstChild("HumanoidRootPart").CFrame*CFrame.new(0,3,-4)
	p.Anchored = true 
	
	p.Parent = game.Workspace
	
	local TweenService = game:GetService("TweenService")
	local Goal = {}
	Goal.Size = Vector3.new(12,12,12)
	local TwInfo = TweenInfo.new(0.5)
	local Tween = TweenService:Create(p, TwInfo, Goal)
	Tween:Play()	
	
	local v = Instance.new("BodyVelocity", p)
	v.maxForce = Vector3.new(math.huge, math.huge, math.huge)
	v.velocity = player.Character:FindFirstChild("HumanoidRootPart").CFrame.lookVector*60
	
	local p1 = Instance.new("Part")
	p1.Shape = "Ball"
	p1.Size = Vector3.new(13,13,13)
	p1.CanCollide = false
	p1.Material = "Neon"
	p1.Transparency = 0.5
	p1.CFrame = p.CFrame
		
	local w = Instance.new("Weld")
	w.Parent = p
	w.Part0 = w.Parent
	w.Part1 = p1
	w.C1 = CFrame.new(0, 0, 0)
	
	p1.Parent = game.Workspace
	
	p.Anchored = false