How do i fix my checkpoint script?the data always go back to 1.

I'm doing a checkpoint system that saves every time the player gets a new checkpoint. The problem is that the player doesn't spawn on the checkpoint,and every time the player leaves and go back to the map the leaderstats go back to 1,even if i change the or to 0. the checkpoint script that is on server scripts.

local DS = game:GetService("DataStoreService")
local PD = DS:GetDataStore("PD")

game.Players.PlayerAdded:Connect(function(plr)
	local leaderstats= Instance.new("Folder", plr)
	leaderstats.Name = "leaderstats"
	local Stage = Instance.new("IntValue", leaderstats)
	Stage.Name= "Stage"
	
	Stage.Value = PD:GetAsync(plr.UserId) or 0
	PD:SetAsync(plr.UserId, Stage.Value)
	Stage.Changed:Connect(function() 
	local success, Error = pcall(function()
		PD:SetAsync(plr.UserId .. "Stage", plr.leaderstats.Stage.Value)
	end)
	if success then
		print("data saved")
	else
		print("error 2 ")
		warn(Error)
	end
	end)
	end)
function checkspawn(players)
	local plr=game.Players:GetPlayerFromCharacter(players)
	if plr~=nil then
	local check=plr.leaderstats
	local value = game.workspace:FindFirstChild(check.Stage.Value)
        print("obby")
       players.HumanoidRootPart.CFrame =players.HumanoidRootPart.CFrame + Vector3.new(0,3,0)
        wait()
      players.HumanoidRootPart.CFrame = value.CFrame + Vector3.new(0,3,0)
	end
end

game.Players.ChildAdded:Connect(checkspawn)

the script on the checkpoints

function ot(hit)
    if hit.Parent ~= nil then
        local players = game.Players:playerFromCharacter(hit.Parent)
            if players ~= nil then
                if players.leaderstats.Stage.Value == script.Parent.Name - 1 then
                local h = hit.Parent:FindFirstChild("Humanoid")
                    if h ~= nil then
                        if h.Health ~= 0 then
                        players.leaderstats.Stage.Value = script.Parent.Name
                       
end
                        end 
                    end
                end
            end 
    end 

script.Parent.Touched:connect(ot)