Positioning the GUI with a local script not working?

I have a script that when a button is clicked it opens a menu and changes the toggle button's position so that it is visible but changes the position to the top left corner instead of above the menu, how do i fix it?

Openpos = UDim2.new({8.39, 0},{0.543, 0})
ClosePos = UDim2.new({8.39, 0},{0.922, 0})

MenuOpen = false

MenuButton = script.Parent.MenuToggle
MenuFrame = script.Parent.MenuFrame

MenuButton.MouseButton1Click:Connect(function()
    if MenuOpen then
        MenuOpen = false
        MenuButton.Position = ClosePos
        MenuButton.Text = "Open Menu"
        MenuFrame.Visible = false
    elseif not MenuOpen then
        MenuOpen = true
        MenuButton.Position = Openpos
        MenuButton.Text = "Close Menu"
        MenuFrame.Visible = true
    end
end)