The data of the minute stat doesn't save all the time, help?

im making a homestore so, I added a script in ServerScriptService to make 2 stats in my leaderboard. the 1st stat counts how much minutes did the player spend in the game. I got this Global LeaderBoard model from the toolbox :https://www.roblox.com/library/5602215077/Global-Leaderboard?ViewInBrowser=true&CreatorId=139133614&SearchId=5B919599-265C-4766-ABAE-0BDE3D01FC1C&Category=Model&Position=2&SearchKeyword=&CreatorType=User&SortType=Relevance and I added it to my homestore and the 2nd stat counts how much outfits the player bought from my homestore.

script:

--[[
	@author TwinPlayzDev_YT
	@since 1/28/2021
	This script will save and put purchases on leaderboard.
--]]


--[ SERVICES ]--

local DataStoreService = game:GetService("DataStoreService")
local DataStore = DataStoreService:GetDataStore("TimeStats")
local service = game:GetService("MarketplaceService")


--[ FUNCTIONS ]--

game.Players.PlayerAdded:Connect(function(Player) 
	--[{ LEADERSTATS }]--

	local Leaderstats = Instance.new("Folder")
	Leaderstats.Name = "leaderstats"
	Leaderstats.Parent = Player

	local Purchases = Instance.new("IntValue")
	Purchases.Name = "Purchases" -- changing name here (points, levels, time, etc.)
	Purchases.Value = 0 -- default value
	Purchases.Parent = Leaderstats

	local Minutes = Instance.new("IntValue") 
	Minutes.Name = "Minutes"
	Minutes.Value = 0 
	Minutes.Parent = Leaderstats


	--[{ DATA STORE }]--

	local Data = DataStore:GetAsync(Player.UserId) -- Get Data

	if type(Data) ~= "table" then
		Data = nil
	end

	if Data then
		Purchases.Value = Data.Purchases
	end




	local Data = DataStore:GetAsync(Player.UserId)
	if Data then
		Minutes.Value = Data
	end

	coroutine.resume(coroutine.create(function()
		while true do
			wait(60)
			Minutes.Value = Minutes.Value + 1
		end
	end))

end)

minute saving script :

-- [ SETTINGS ] --

local statsName = "Minutes" -- Your stats name
local maxItems = 100 -- Max number of items to be displayed on the leaderboard
local minValueDisplay = 1 -- Any numbers lower than this will be excluded
local maxValueDisplay = 10e15 -- (10 ^ 15) Any numbers higher than this will be excluded
local abbreviateValue = true -- The displayed number gets abbreviated to make it "human readable"
local updateEvery = 60 -- (in seconds) How often the leaderboard has to update
local headingColor = Color3.fromRGB(25, 181, 254) -- The background color of the heading

-- [ END SETTINGS ] --




-- Don't edit if you don't know what you're doing --

local DataStoreService = game:GetService("DataStoreService")
local Players = game:GetService("Players")
local DataStore = DataStoreService:GetOrderedDataStore("GlobalLeaderboard_" .. statsName)
local Frame = script.Parent.Frame
local Contents = Frame.Contents
local Template = script.objTemplate

local COLORS = {
	Default = Color3.fromRGB(38, 50, 56),
	Gold = Color3.fromRGB(255, 215, 0),
	Silver = Color3.fromRGB(192, 192, 192),
	Bronze = Color3.fromRGB(205, 127, 50)
}
local ABBREVIATIONS = { "K", "M", "B", "T" }


local function toHumanReadableNumber(num)
	if num < 1000 then
		return tostring(num)
	end
	
	local digits = math.floor(math.log10(num)) + 1
	local index = math.min(#ABBREVIATIONS, math.floor((digits - 1) / 3))
	local front = num / math.pow(10, index * 3)
	
	return string.format("%i%s+", front, ABBREVIATIONS[index])
end

local function getItems()
	local data = DataStore:GetSortedAsync(false, maxItems, minValueDisplay, maxValueDisplay)
	local topPage = data:GetCurrentPage()

	Contents.Items.Nothing.Visible = #topPage == 0 and true or false

	for position, v in ipairs(topPage) do
		local userId = v.key
		local value = v.value
		local username = "[Not Available]"
		local color = COLORS.Default

		local success, err = pcall(function()
			username = Players:GetNameFromUserIdAsync(userId)
		end)

		if position == 1 then
			color = COLORS.Gold
		elseif position == 2 then
			color = COLORS.Silver
		elseif position == 3 then
			color = COLORS.Bronze
		end

		local item = Template:Clone()
		item.Name = username
		item.LayoutOrder = position
		item.Values.Number.TextColor3 = color
		item.Values.Number.Text = position
		item.Values.Username.Text = username
		item.Values.Value.Text = abbreviateValue and toHumanReadableNumber(value) or value
		item.Parent = Contents.Items
	end
end


script.Parent.Parent.Color = headingColor
Frame.Heading.ImageColor3 = headingColor
Frame.Heading.Bar.BackgroundColor3 = headingColor

while true do
	for _, player in pairs(Players:GetPlayers()) do
		local leaderstats = player:FindFirstChild("leaderstats")

		if not leaderstats then
			warn("Couldn't find leaderstats!")
			break
		end

		local statsValue = leaderstats:FindFirstChild(statsName)

		if not statsValue then
			warn("Couldn't find " .. statsName .. " in leaderstats!")
			break
		end

		pcall(function()
			DataStore:UpdateAsync(player.UserId, function()
				return tonumber(statsValue.Value)
			end)
		end)
	end

	for _, item in pairs(Contents.Items:GetChildren()) do
		if item:IsA("Frame") then
			item:Destroy()
		end
	end

	getItems()

	wait()
	Frame.Heading.Heading.Text = statsName .. " Leaderboard"
	Contents.GuideTopBar.Value.Text = statsName
	wait(updateEvery)
end

but when the player joins the game for the first time his minute stat data saves but when he rejoins twice it somehow becomes less. for example, it's my first time joining the game, i played the game for 10 minutes then i had to go, so i join the next day and my minute stat is 10 which was the same as yesterday and I play the game for 5 minutes so my minute stat becomes 15, then i join the next day and my minute stat is 10. it didn't save my stat of the 2nd day, does anyone know how to figure this out??