cash loading script gives players money randomly???

so in my game some people after rejoining have been getting large amounts of money. for example my friend had around 20 millions and after a rejoin he got 6 billions. he rejoined because of a massive lag. could it be because of the lag? here is the cash save/load script. i think its ok.

local datastore = game:GetService("DataStoreService")
local ds1 = datastore:GetDataStore("Cash24")
game.Players.PlayerAdded:Connect(function(plr)
	local cash = game.ServerStorage.MoneyStorage:WaitForChild(plr.Name)
	local success,err = pcall(function()
		cash.Value = ds1:GetAsync(plr.UserId) or 0
	end)
	if success then
		print("Your Data Has Been Loaded.")
	else
		print("Your Data Loading Has Failed.")
		warn(err)
	end
end)

game.Players.PlayerRemoving:Connect(function(plr)
	local cash = game.ServerStorage.MoneyStorage:FindFirstChild(plr.Name)
	local success,err = pcall(function()
		ds1:SetAsync(plr.UserId, cash.Value)
	end)
	if success then
		print("Your Data Has Been Saved.")
	else
		print("We Got An Error While Saving Your Data.")
		warn(err)
	end
end)