Leaderstat saving somehow broke over time?

I've been using a stat script in my game and it has been saving until one time when everyone started telling me that their stats didn't save. I don't know what the reason is. This is the script:

game.Players.PlayerAdded:Connect(function(plr)
	local DS = game:GetService("DataStoreService")

	local Stats = Instance.new("Folder", plr)
	Stats.Name = "Stats"    

	for i,v in pairs(script:GetChildren()) do    
		local DSnew = DS:GetDataStore(v.name)
		local newStat = Instance.new("NumberValue",Stats)
		newStat.Name = v.Name
		newStat.Value = DSnew:GetAsync(plr.userId.."-testdatastores") or v.value
	end
end)



game. Players.PlayerRemoving:Connect(function(plr)    
	for i,v in pairs(script:GetChildren()) do
		print("Accept!")
		local DS = game:GetService("DataStoreService")
		local DSnew = DS:GetDataStore(v.name)
		DSnew:SetAsync(plr.UserId.."-testdatastores", plr.Stats[v.name].Value)  
		print("Saved!")
	end
end)

It has a couple of NumberValues with the stat names but nothing happened when I added more, it just kind of started to break out of nowhere and I need help on understanding why this happened and how can I possibly fix this issue.