My gui is not appearing on a local script. Why?

I am working on a movement gui that allows people to teleport. It works fine when the remote event is fired the first time, but when its fired another time, it stops turning visible, despite the workspace saying its visible. What is going on?

Local Script (In StarterCharacterScripts):

player = game.Players.LocalPlayer
character = player.Character or player.CharacterAdded:Wait()
humanoid = character:WaitForChild("Humanoid")
assignRoutes = game.ReplicatedStorage.Remotes.AssignRoutes
canPass1 = game.ReplicatedStorage.Remotes.CanPass1
canPass2 = game.ReplicatedStorage.Remotes.CanPass2
getWeapon = game.ReplicatedStorage.Remotes.GetWeapon
door1 = workspace.EmptyHouse.Door1.Closed
door2 = workspace.EmptyHouse.Door2.Closed
playerGui = player:WaitForChild("PlayerGui")
gui = playerGui:WaitForChild("BloxianPanel")
frame = gui:WaitForChild("EmptyHouseNavigation")
moveOn = frame:WaitForChild("MoveOn")

assignRoutes.OnClientEvent:Connect(function(path)
    print("Route Received")
    local route = path
    local index = 1
    local timer = 0
    humanoid.WalkSpeed = 0
    humanoid.JumpPower = 0
    character:MoveTo(route[index].Position)
    wait(15)
    moveOn.Visible = true

    moveOn.MouseButton1Click:Connect(function()
        timer = 0
        if index == #route then
            if route[index] == workspace.EmptyHouse.BloxianTeleports.DoorTeleports.Door1 then
                if not canPass1:InvokeServer() then
                    character:MoveTo(workspace.EmptyHouse.BloxianTeleports.JumpscareZone.Position)
                    humanoid.WalkSpeed = 16
                    humanoid.JumpPower = 50
                    getWeapon:FireServer()
                    moveOn.Visible = false
                    return
                else
                    index = 0
                end
            end

            if route[index] == workspace.EmptyHouse.BloxianTeleports.DoorTeleports.Door2 then
                if not canPass2:InvokeServer() then
                    character:MoveTo(workspace.EmptyHouse.BloxianTeleports.JumpscareZone.Position)
                    humanoid.WalkSpeed = 16
                    humanoid.JumpPower = 50
                    getWeapon:FireServer()
                    moveOn.Visible = false
                    return
                else
                    index = 0
                end
            end
        end
        index = index + 1
        character:MoveTo(route[index].Position)

        moveOn.Visible = false
        wait(8)
        moveOn.Visible = true

        while true do
            if moveOn.Visible == true then
                wait(1)
                timer = timer + 1
                if timer == 8 then
                    index = 1
                    character:MoveTo(route[index].Position)
                    break
                end
            else
                break
            end
        end
    end)
end)