My script only runs once then it stops firing the function. Any help?

So I tested my script out and it only ran once and then the next person who joined it didn't run. I suspect its an error, but I can not find it no matter how many times i look through it. Maybe one of you can? Here is the script:

for i = 1, leader.MaxPlayers.Value do
local x = Instance.new("TextLabel")
x.Parent = leader.Players
x.Name = "Player" .. i .. "L"
x.Size = UDim2.new(0, 120, 0, 10)
x.FontSize = "Size14"
x.TextColor3 = Color3.new(color)
x.BackgroundTransparency = 1
x.BorderSizePixel = 0
x.Position = UDim2.new(0, 50, 0, 50) + UDim2.new(0, 0, 0, 20*i)
x.Visible = false
-------------------- LABELS MADE ------------------------------
local w = Instance.new("StringValue")
w.Parent = leader.Players
w.Name = "Player" .. i 
table.insert(playerlist, x)
table.insert(playervalue, w)    
end
game.Players.PlayerAdded:connect(function(plr)
for i, v in pairs(playervalue) do
    if adding == false then
    if v.Value == "" then
        v.Value = plr.Name
        print("Player Added")
        adding = true
    end
    end
end
adding = false
if Stats == true then
        game.StarterGui.Leaderboard.Stats2.Value = true
    local starterstats = Instance.new("Model")
    if StatsName ~= "" then
    starterstats.Name = StatsName
    starterstats.Parent = plr
    end
    if Stat1 ~= "" then
    local firststat = Instance.new(Stat1Type)
    firststat.Parent = starterstats

    firststat.Value = Stat1Value
    firststat.Name = Stat1
    end
    if Stat2 ~= "" then
        local secondstat = Instance.new(Stat2Type)
            secondstat.Parent = starterstats
        secondstat.Value = Stat2Value
        secondstat.Name = Stat2
    end
    if Stat3 ~= "" then
    local thirdstat = Instance.new(Stat3Type)
    thirdstat.Parent = starterstats
    thirdstat.Value = Stat3Value
    thirdstat.Name = Stat3
    end

game.Players.PlayerAdded:connect(function(plr)
for i, v in pairs(playervalue) do
    if adding == false then
    if v.Value == "" then
        v.Value = plr.Name
        print("Player Added")
        adding = true
    end
    end
end
adding = false
if Stats == true then
        game.StarterGui.Leaderboard.Stats2.Value = true
    local starterstats = Instance.new("Model")
    if StatsName ~= "" then
    starterstats.Name = StatsName
    starterstats.Parent = plr
    end
    if Stat1 ~= "" then
    local firststat = Instance.new(Stat1Type)
    firststat.Parent = starterstats

    firststat.Value = Stat1Value
    firststat.Name = Stat1
    end
    if Stat2 ~= "" then
        local secondstat = Instance.new(Stat2Type)
            secondstat.Parent = starterstats
        secondstat.Value = Stat2Value
        secondstat.Name = Stat2
    end
    if Stat3 ~= "" then
    local thirdstat = Instance.new(Stat3Type)
    thirdstat.Parent = starterstats
    thirdstat.Value = Stat3Value
    thirdstat.Name = Stat3
    end