Error with trying to tween the position of 3 ImageLabels. Help?

If I could put a video, I would.

I'm trying to make a loading screen where three dots will simultaneously move up and down, like they are bouncing. The first dot moves up, then the second, then the third. Then, it goes in that same exact order, except they will all move back down.

The problem here, is that the first dot will move up, then the second, then the third. Then the moment when they will go in that same order moving back down, the second and third dots will stay in the up position instead of moving back down. They will not move back down forever and I cannot find out how to solve this issue.

Here is the script that makes the loading animation play until the game is loaded:

game.ReplicatedFirst:RemoveDefaultLoadingScreen()

local PlayerGui = game.Players.LocalPlayer:WaitForChild("PlayerGui")

local GUI = script.loadingGui:Clone()
GUI.Parent = PlayerGui

local function loadingAnimation()

    GUI.loadingFrame.loadingPeriod1:TweenPosition(UDim2.new(GUI.loadingFrame.loadingPeriod1.Position.X.Scale,0,.205,0),"Out","Sine",0.5)
    wait(.2)
    GUI.loadingFrame.loadingPeriod2:TweenPosition(UDim2.new(GUI.loadingFrame.loadingPeriod2.Position.X.Scale,0,.205,0),"Out","Sine",0.5)
    wait(.2)
    GUI.loadingFrame.loadingPeriod3:TweenPosition(UDim2.new(GUI.loadingFrame.loadingPeriod3.Position.X.Scale,0,.205,0),"Out","Sine",0.5)
    wait(.1)
    GUI.loadingFrame.loadingPeriod1:TweenPosition(UDim2.new(GUI.loadingFrame.loadingPeriod1.Position.X.Scale,0,0.567,0),"In","Sine",0.5)
    wait(.1)
    GUI.loadingFrame.loadingPeriod2:TweenPosition(UDim2.new(GUI.loadingFrame.loadingPeriod2.Position.X.Scale,0,0.567,0),"In","Sine",0.5)
    wait(.1)
    GUI.loadingFrame.loadingPeriod3:TweenPosition(UDim2.new(GUI.loadingFrame.loadingPeriod3.Position.X.Scale,0,0.567,0),"In","Sine",0.5)
    wait(2)

end

repeat loadingAnimation() until game:IsLoaded()

GUI.backgroundFrame1:TweenPosition(UDim2.new(-1,0,0,0),"Out","Sine",1)
GUI.backgroundFrame2:TweenPosition(UDim2.new(2,0,0,0),"Out","Sine",1)
wait(.5)
GUI:Destroy()