I need this ImageButton to go back to its place once I let go?

I have a script that when you HOLD the rock image it moves to your mouse but when I let go it doesn't go back to its spot?

If you are wondering why I have "-660, -650" its to make the image be on my mouse and not somewhere else

local player = game:GetService("Players").LocalPlayer
local mouse = player:GetMouse()

script.Parent.MouseButton1Down:Connect(function()
    repeat
        wait()
        local val = script.Parent.CanMove.Value
        wait(0.01)
        script.Parent.Durability.Visible = false
        script.Parent.Position = UDim2.new(0, mouse.X -660, 0, mouse.Y -650)
    until val == 1
end)

script.Parent.MouseButton1Up:Connect(function()
    local val = script.Parent.CanMove.Value
    val = 1
    script.Parent.Durability.Visible = true
    script.Parent.Position = UDim2.new(0,0,0,0)
end)