Functions not firing inside module script?

I am currently making a database system using module scripts like the one from the roblox articles page.

http://developer.roblox.com/en-us/articles/Saving-Player-Data

The script connects events to functions.

game.Players.PlayerAdded:Connect(setupPlayerData)

It does this for 2 events. PlayerAdded and PlayerRemoving.

However when I made my own version of this code. Using adaptations from the article page. Only the PlayerRemoving function fires. And not consistently either. Sometimes it prints the player removing message sometimes it doesn't. And the PlayerAdded function never fires, never outputs.

What have I tried?

• I've tried debugging my own code using prints. This is how I know it doesn't consistently work for PlayerRemoving and how I know PlayerAdded doesn't work at all.

• I've tried rewriting the code for executing the functions. I've turned them into 1 liners and achieved even worse results from doing so. What I mean by 1 liners (since I don't know the actual name)

game.Players.PlayerAdded:Connect(function(Player)

end)

Here is my code: (Any help is really appreciated I've been stuck on this for a while now!)

local PlayerStats_Manager = {}
local SessionStats = {}

local DataStoreService = game:GetService("DataStoreService")
local PlayerData = DataStoreService:GetDataStore("PlayerData")

function AddNewPlayer(Player)
    print("add player")
    local Key = Player.UserId
    local DataStore
    local Success, Error = pcall(function()
        DataStore = PlayerData:GetAsync(Key)
    end)
    if not Success then
        warn("Could not load data for ".. Player.Name .." ".. tostring(Error))
    end
    if Success then
        print("Already had data on player stored")
        SessionStats[Key] = DataStore
    else
        print("No data on player")
        SessionStats[Key] = {
            ["Money"] = 0,
        }
    end
end

function PlayerRemoving(Player)
        print("removing player")
    local Key = Player.UserId
    local Success, Error = pcall(function()
        PlayerData:SetAsync(Key, SessionStats[Key])
    end)
    if Success then
        print("Saved")
    else
        warn(Error)
    end
end

function PlayerStats_Manager:ChangeStats(Key, Stat, NewValue)
    print("player stat")
    SessionStats[Key] = {
        [Stat] = NewValue,
    }
end

game.Players.PlayerAdded:Connect(AddNewPlayer)
game.Players.PlayerRemoving:Connect(PlayerRemoving)

return PlayerStats_Manager