Why doesnt this datastore/leaderboard script work?

Hey. Thanks for Clicking :) So, my next game uses a Datastore to save the Player's Leaderstats. I have two problems with this. 1) When the player wins a game, a win is not added to the leaderboard. 2) I dont know if it stores or loads their data, because there is never anything to store. I'll post that anyway. Here's the script that is supposed to add a win.

function awardwin(players)
    if type(players) == type({}) then
    print("player is in table") -- this prints

        for i = 1, #players do
    if players[i]:FindFirstChild("MatchTag") then
            if players[i]:FindFirstChild("leaderstats") then
                if  players[i].leaderstats:FindFirstChild("Wins") then 
                    local stat = players[i].leaderstats.Wins
                    stat.Value = stat.Value + 1
                    print("added wins") -- this never fires

                end
            end
        end
    end
end
end

This is when the function is called in the main script.

while localtimer > 0  do
    print("Run")
    wait(1)
    localtimer = localtimer - 1
    activecontestants = {}
    for _, player in pairs(contestants) do
        if player then
            local character = player.Character
            if character then
                local humanoid = character:FindFirstChild("Humanoid")
                local matchtag = character:FindFirstChild("MatchTag")
            if matchtag and humanoid and humanoid.Health > 0 then
                table.insert(activecontestants, player)
            end
            end
        end
    end
    if #activecontestants <= 1 then
        awardwin(players)
        awardcredit(players, 4)

        break

    end
end

Finally, this is where the player's data is saved

game.Players.PlayerRemoving:connect(function(player)
    local newTab = {}
    local tab = myData:GetAsync(player.userId)

    local num = 0
    for i = 1,#tab do
        num = num + 1       
        for a,b in pairs(player.leaderstats:GetChildren()) do
            if b.Name == tab[i][1] then
                table.insert(newTab,{tab[i][1],tab[i][2],tab[i][3]})
            end
        end
        if num % 10 == 0 then
            wait()
        end
    end
    myData:SetAsync(player.userId,newTab)
end)

Thanks!