The following script works and the map generates sometimes not all the times?

The map sometime generates randomly but doesn't other times, can I please get some help with the teleportation I used to store maps in lighting but now I switched it to ServerStorage.

the code is below

-- Variables
	 
	local player = game.Players:GetChildren()
 
	local maps = game.ServerStorage.Maps:GetChildren()
	 
	local currentmap = game.Workspace:WaitForChild("CurrentMap")
	 
	local chosenmap = script:WaitForChild("ChosenMap")
	 
	local spawner = game.Workspace:WaitForChild("Spawn")
	 
	local choices = {}
	 
	function choosemap()
	 
	for i = 1,#maps do
	 
	if maps[i]:isA("Model") then
	 
	table.insert(choices,maps[i])
	 
	local picked = math.random(1,#maps) chosenmap.Value = choices[picked].Name
	 
	       end
	   end
	end
	 
	function loadmap()
	 
	local map = game.ServerStorage.Maps:FindFirstChild(chosenmap.Value)
	 
	map:Clone().Parent = currentmap
	 
	end
	 
	function deleteMap()
	 
	for i,v in pairs(currentmap:GetChildren()) do
	 
	if v:isA("Model") then
	 
	v:Destroy()
	 
	      end
	   end
	end
	 
	 
	function teleportPlayers()
	 
	for i,v in pairs() do
	 
	v.Character:FindFirstChild("HumanoidRootPart").CFrame = currentmap:FindFirstChild(chosenmap.Value).Spawn * CFrame.new(math.random(5,10),0,math.random(5,10))
	 
	   end
	end
	 
	function teleportBack()
	 
	for i,v in pairs(player) do
	 
	v.Character:FindFirstChild("HumanoidRootPart").CFrame = spawner.Spawnlocation.CFrame* CFrame.new(math.random(5,10),0,math.random(5,10))
	 
	end
	 
	end
	 
	while true do
	 
	wait(3)
	 
	choosemap()
	loadmap()
	wait(1)
	teleportPlayers()
	wait(10)
	deleteMap()
	teleportBack()
	 
	end