currency DataStore wont save :( please help?

I've made a datastore script to save rebirths, coins and gems. I get no errors (yey) but it just doesnt save (not yey). I have API services turned on and am testing it via roblox.com not studio. I must be doing smth wrong eh? cheers for the help if any.

local DataStoreService = game:GetService("DataStoreService")

local playerData = DataStoreService:GetDataStore("PlayerData")

local function onPlayerJoin(Player)
	local leaderstats = Instance.new("Folder", Player)
	leaderstats.Name = "leaderstats"
	
	local val1 = Instance.new("StringValue",Player)
	val1.Name = 'GotPet'
	val1.Value = ''

	local val2 = Instance.new("StringValue",Player)
	val2.Name = 'OpenValue'
	val2.Value = ''
	
	local Gems = Instance.new("IntValue", leaderstats)
	Gems.Name = "Gems"
	Gems.Value = 0
	
	local Rebirths = Instance.new("IntValue", leaderstats)
	Rebirths.Name = "Rebirths"
	Rebirths.Value = 0
	
	local Coins = Instance.new("IntValue", leaderstats)
	Coins.Name = "Coins"
	Coins.Value = 0
	
	local playerUserId = "Player_" .. Player.UserId  --Gets player ID

	local data = playerData:GetAsync(playerUserId)  --Checks if player has stored data

	if data then
		print("Data found!")

		-- Data exists for this player

		Coins.Value = data
		Rebirths.Value = data
		Gems.Value = data

	else
		print("DataStore working but No data found")

		-- Data store is working, but no current data for this player

		Coins.Value = 0
		Rebirths.Value = 0
		Gems.Value = 0

	end

end
	
local function onPlayerExit(player)  --Runs when players exit



	local success, error = pcall(function()
		print("Data loaded successfully")

		local playerUserId = "Player_" .. player.UserId

		playerData:SetAsync(playerUserId, player.leaderstats.Coins.Value)
		playerData:SetAsync(playerUserId, player.leaderstats.Rebirths.Value)
		playerData:SetAsync(playerUserId, player.leaderstats.Gems.Value)--Saves player data

	end)



	if not success then

		warn('Could not save data!')
	end
end

game.Players.PlayerAdded:Connect(onPlayerJoin)

game.Players.PlayerRemoving:Connect(onPlayerExit)

The way you save is wrong. It's gonna overwhelm the DatastoreService at times, and it's also gonna OVERWRITE everything that was set as the new one. (Like what you did, you saved Coins, but in the next line, you overwrite Coins with Rebirths.) It should be a table if you have multiple values.

And also the way that you load it is also wrong, like I said, using tables is best if you have multiple values to load.

Also, you should ALWAYS use pcall() if you're operating with Datastores. Only with the Async, though.

Here is my fix: (Untested)

local DataStoreService = game:GetService("DataStoreService")

local playerData = DataStoreService:GetDataStore("PlayerData")

local function onPlayerJoin(Player)
	local leaderstats = Instance.new("Folder", Player)
	leaderstats.Name = "leaderstats"

	local val1 = Instance.new("StringValue",Player)
	val1.Name = 'GotPet'
	val1.Value = ''

	local val2 = Instance.new("StringValue",Player)
	val2.Name = 'OpenValue'
	val2.Value = ''

	local Gems = Instance.new("IntValue", leaderstats)
	Gems.Name = "Gems"
	Gems.Value = 0

	local Rebirths = Instance.new("IntValue", leaderstats)
	Rebirths.Name = "Rebirths"
	Rebirths.Value = 0

	local Coins = Instance.new("IntValue", leaderstats)
	Coins.Name = "Coins"
	Coins.Value = 0

	local playerUserId = "Player_" .. Player.UserId  --Gets player ID

	local Success, Result = pcall(function()
		return playerData:GetAsync(playerUserId)
	end)

	if Result then
		print("Data found!")
		
		Coins.Value = Result[1] -- // Since in the saving part, Coins are the one that is set as the first value of the table, we set Coins as [1]
		Rebirths.Value = Result[2]
		Gems.Value = Result[3]
	else
		print("DataStore working but No data found")
		warn(Result)
	end

end

local function onPlayerExit(player)  --Runs when players exit



	local success, Err = pcall(function()
		print("Data Saved successfully")

		local playerUserId = "Player_" .. player.UserId

		playerData:SetAsync(playerUserId, {player.leaderstats.Coins.Value, player.leaderstats.Rebirths.Value, player.leaderstats.Gems.Value}) -- Now set as a table instead of individually

	end)



	if not success then
		warn(Err)
		warn('Could not save data!')
	end
end

game.Players.PlayerAdded:Connect(onPlayerJoin)

game.Players.PlayerRemoving:Connect(onPlayerExit)