TweenService:Create() doesn't work as intended?

Heres the code :

local dropdown = script.Parent.Parent.Dropdown
local tweeninfo = TweenInfo.new(.5,Enum.EasingStyle.Sine,Enum.EasingDirection.Out)
local tweenservice = game:GetService("TweenService")
script.Parent.Activated:Connect(function()
	if dropdown.Visible == false then
		dropdown.Visible = true
		local tween = tweenservice:Create(dropdown,tweeninfo,{Size = UDim2.new(0.418,00.337, 0)})
		tween:Play()
	else
		local tween2 = tweenservice:Create(dropdown,tweeninfo,{Size = UDim2.new(0.418, 0,0, 0)})
		tween2:Play()
		tween2.Completed:Connect(function() dropdown.Visible = false end)
	end
end)

Whenever I close and re-open the frame it doesn't scale itself properly.