Why is my custom chat duplicating chats after death?

function NewLabel(parent, msg, player)
    newchatline = Instance.new("TextLabel", parent)
    newchatline.Text = player.Name.. ": " ..msg
    newchatline.Size = UDim2.new(1,0,0,15)
    newchatline.Position = UDim2.new(0,0,1,-15)
    newchatline.Font = "SourceSansBold"
    newchatline.TextColor3 = Color3.new(1,1,1)
    newchatline.TextStrokeTransparency = 0
    newchatline.BackgroundTransparency = 1
    newchatline.BorderSizePixel = 0
    newchatline.FontSize = "Size14"
    newchatline.TextXAlignment = "Left"
    newchatline.TextYAlignment = "Top"
    newchatline.ClipsDescendants = true
    newchatline.Name = "line1"
end

function UpdateOldLabels(Parent)
    for i,v in pairs(Parent:GetChildren()) do
        if v.Name:sub(1,4):lower() == "line" then
            local LineNumber = v.Name:sub(5)
            if LineNumber == "12" then
                v:Destroy()
            else
                v.Name = "line"..tostring(tonumber(LineNumber) + 1)
                v.Position = v.Position - UDim2.new(0,0,0,15)
            end
        end
    end
end

game:GetService("Players").PlayerAdded:connect(function(player)
    player.Chatted:connect(function(msg)
        for _,v in ipairs(game:GetService("Players"):GetChildren()) do
            UpdateOldLabels(v:WaitForChild("PlayerGui").ScreenGui.Frame)
            UpdateOldLabels(game:GetService("StarterGui").ScreenGui.Frame)
            NewLabel(v:WaitForChild("PlayerGui").ScreenGui.Frame, msg, player)
            NewLabel(game:GetService("StarterGui").ScreenGui.Frame, msg, player)
        end
    end)
end)

I used the wiki tutorial to create this. When the player dies all old chats are duplicated. This is not really a major problem but it is annoying.

Below are my attempts to correct this.

game:GetService("Players").PlayerAdded:connect(function(player)
    player.Chatted:connect(function(msg)
        for _,v in ipairs(game:GetService("Players"):GetChildren()) do
            UpdateOldLabels(v:WaitForChild("PlayerGui").ScreenGui.Frame)
        -- UpdateOldLabels(game:GetService("StarterGui").ScreenGui.Frame)
            NewLabel(v:WaitForChild("PlayerGui").ScreenGui.Frame, msg, player)
            NewLabel(game:GetService("StarterGui").ScreenGui.Frame, msg, player)
        end
    end)
end)

Commenting this line stopped the duplication of old chats but moved them all to the same line.

game:GetService("Players").PlayerAdded:connect(function(player)
    player.Chatted:connect(function(msg)
        for _,v in ipairs(game:GetService("Players"):GetChildren()) do
            UpdateOldLabels(v:WaitForChild("PlayerGui").ScreenGui.Frame)
            UpdateOldLabels(game:GetService("StarterGui").ScreenGui.Frame)
            NewLabel(v:WaitForChild("PlayerGui").ScreenGui.Frame, msg, player)
            --NewLabel(game:GetService("StarterGui").ScreenGui.Frame, msg, player)
        end
    end)
end)

Commenting that line caused all old chats to be removed on death.

I haven't done custom chat before so any help will be appreciated. Thanks!