Data Store Script Doesn't Save Data. Help?

It will not save any data at all. It prints no errors at all.

-- Variables
local Players = {};
local NumPlayers = #Players;
local ReplicatedStorage = game:GetService("ReplicatedStorage");
local Assets = ReplicatedStorage:WaitForChild("Assets");
local Rounds = Assets:WaitForChild("Rounds");
local LavaRise = Rounds:WaitForChild("LavaRising");
local Stand = LavaRise:WaitForChild("Stand");
local PlayerStats = Assets:WaitForChild("Player_Stats");
local DataStoreService = game:GetService("DataStoreService");
local DataStore = DataStoreService:GetDataStore("MiniGamesV1");

local GameRounds = {"LavaRising",};

-- Functions/Main Game
function addPlayer(Player)
    table.insert(Players,Player);
end

function removePlayer(Player)
    for i,v in pairs(Players) do
        if v == Player then
            table.remove(Players,v);
        end
    end
    local Stats = PlayerStats:FindFirstChild(Player.Name);
    Stats:Destroy();
end

function chooseRound()
    local random = math.random(1,#GameRounds);
    local Picked = GameRounds[random];
    return Picked;
end

function LavaRising(Map,Lava,Stands)

end

function Joined(Player)
    addPlayer(Player); -- Adds player to the table "Players"
    local Stats = Instance.new("Folder");
    Stats.Name = Player.Name;
    Stats.Parent = PlayerStats;
    local Wins = Instance.new("NumberValue");
    Wins.Name = "Wins";
    Wins.Parent = Stats;
    Wins.Value = 0;
    local Coins = Instance.new("NumberValue");
    Coins.Name = "Coins";
    Coins.Parent = Stats;
    Coins.Value = 1000;
    local XP = Instance.new("NumberValue");
    XP.Name = "XP";
    XP.Parent = Stats;
    XP.Value = 0;
    local userdata;
    pcall(function()
        userdata = DataStore:GetAsync("!"..Player.userId);
    end)
    if userdata then
        warn("Got "..Player.Name.."'s data!");
        Wins.Value = userdata.Wins;
        Coins.Value = userdata.Coins;
        XP.Value = userdata.XP;
    else
        warn(Player.Name.." has no saved data yet!");
    end
end

function leave(Player)
    removePlayer(Player); -- Removes player from table "Players"
    local Stats = PlayerStats:FindFirstChild(Player.Name);
    local wins = Stats.Wins;
    local coins = Stats.Coins;
    local xp = Stats.XP;
    local StatTab = {Wins = wins.Value,Coins = coins.Value,XP = xp.Value};
    local userdata;
    pcall(function()
        userdata = DataStore:GetAsync("!"..Player.userId);
    end)
    if userdata then
        DataStore:UpdateAsync("!"..Player.userId,StatTab);
    else
        DataStore:SetAsync("!"..Player.userId,StatTab);
    end
end

game.Players.PlayerAdded:Connect(Joined);
game.Players.PlayerRemoving:Connect(leave);