Why does this array read fine in one function, but empty in another?

I have tried reading the array variable Players by accessing it like module.Players from an outside script, and I have also had a getStat function which returned Players, however the getStat function (which was inside the module) read the array as empty, even though changeStat reads it as having one entry.

****statService (Module In ServerScriptService)

local module = {}
    module.Players = {}

    function checkPlayers(plr)
        for i = 1,#module.Players do
            if module.Players[i][1] == plr then
                return i
            end
        end
        return 0
    end


    module.changeStat = function(player,stat,value)
        local index = checkPlayers(player.Name)

        if index == 0 then

            module.Players[#module.Players+1] = {player.Name,0,0,0,0} --Player Name,K,D,Dm,H
            index = checkPlayers(player.Name)
        end

        module.Players[index][stat] = module.Players[index][stat] + value

        for a = 1,#module.Players do
            for b = 1,#module.Players[a] do
                print(b..": "..module.Players[a][b])
            end
        end
    end

return module