Why do spheres stack?

trying to sb and i tried to make a sphere that kills people a little but they stack everything works they just stack and i dont know how to fix

local plr = game.Players.LocalPlayer
local mouse = plr:GetMouse()
local chr = plr.Character or plr.CharacterAdded:wait()
 
local part = Instance.new("Part")
part.Size = Vector3.new(1,1,1)
part.CanCollide = false
part.BrickColor = BrickColor.White()
part.Anchored = true
part.FormFactor = "Custom"
part.BottomSurface = "Smooth"
part.TopSurface = "Smooth"
 
local mesh = Instance.new("SpecialMesh",part)
mesh.MeshType = "Sphere"
 
debounce = false
 
mouse.KeyDown:connect(function(key)
	if key == 'z' or key == 'x' then
		local clone = part:Clone()
			clone.Parent = chr
			if key == 'x' then
				clone.BrickColor = BrickColor.Blue()
			end
			clone.Touched:connect(function(p)
			local h = p.Parent:FindFirstChild("Humanoid")
			if h and h.Parent.Name ~= 'supercoolguy53' then
				if key == 'z' then
					debounce = true
					local damage = h.MaxHealth/20
					h.Health = h.Health - damage
				elseif key == 'x' and debounce == false then
					debounce = true
					local freeze = part:Clone()
					freeze.Parent = h.Parent
					freeze.Size = Vector3.new(7,7,7)
					h.Parent.Torso.Anchored = true
					wait(5)
					h.Parent.Torso.Anchored = false
					freeze:Destroy()
					debounce = false
				end
			end
		end)
		for i = 1,100 do
			if i == 100 then
				wait(1)
				for i = 1,100 do
					game:GetService('RunService').RenderStepped:wait()
					clone.Size = clone.Size - Vector3.new(.2,.2,.2)
				end
				clone:Destroy()
			end
			game:GetService('RunService').RenderStepped:wait()
			clone.CFrame = chr.Torso.CFrame
			clone.Size = clone.Size + Vector3.new(.2,.2,.2)
		end
	end
end)

they stack ontop of my head and ontop of each other.