Why in the World Does This Leaderboard Gui Not Work with FilteringEnabled?

I have been trying to get the hang of FilteringEnabled for weeks and I am really starting to get agitated. Based on my understanding, with it on, the client cannot access the Workspace; only client-related information can be accessed by the client, such as the PlayerGui. If my understanding is correct, then I simply cannot see any reason why this leaderboard script does not work.

I want to make a custom leaderboard for my game; in my game, a maximum of 12 players can play at a time. My leaderboard is supposed to display the player's name, his or her level, and, if he or she is in prestige mode, an icon shows next to their name that displays their prestige level. (If you've ever played Call of Duty multiplayer, this should seem familiar to you) This is how my leaderboard is set out: a ScreenGui in the StarterGui holds a Frame which holds 12 more frames named 1 through 12, each with an ImageLabel named Prestige, a TextLabel named Player, and another TextLabel named Level.

Inside of the Frame within the Frame is a script which does all of the magic. When I test this script on a server, it does not work at all. No error is returned; the leaderboard is blank and nothing happens. When I turn FilteringEnabled off, it works exactly as it should. I have no clue as to why.

This is the script.

while wait(.1) do
	player = script.Parent.Parent.Parent.Parent --Getting the player
	gui = player.PlayerGui --Getting the player's PlayerGui
	if player.Stats then --Upon joining the game, the game should create a folder named "Stats" which holds the player's Level and Prestige. If it has not been created yet, then this will not work.
		playerLevel = player.Stats.Level --Getting the player's Level
		playerPrestige = player.Stats.Prestige --Getting the player's Prestige
		if playerPrestige.Value < 1 then --If the player has no Prestige, the name will shift all the way to the left and no image will be shown.
			script.Parent[1].Prestige.Image = ""
			script.Parent[1].Player.Position = UDim2.new(0, 0, 0, 0)
		else --If there is, the name will shift over by 20 to give room to the 20x20 image that will display the Prestige icon.
			script.Parent[1].Player.Position = UDim2.new(0, 20, 0, 0)
			if playerPrestige.Value >= 10 and playerLevel.Value >= 50 then --10 is the maximum Prestige and 50 is the maximum Level; if the player meets this criteria, he or she gets the Master Prestige icon.
				script.Parent[1].Prestige.Image = gui.Prestige.Master.Value
			else
				findIcon = gui.Prestige:FindFirstChild(playerPrestige)
				if findIcon then
					script.Parent[1].Prestige.Image = findIcon.Value
				end
			end
		end
		script.Parent[1].Player.Text = " " ..player.Name --Adding a space at the start because I thought the text looked a little too close to the edge of the leaderboard.
		script.Parent[1].Level.Text = playerLevel.Value
		players = game.Players:GetChildren() --Getting all of the players
		script.Parent.Size = UDim2.new(0, 200, 0, 20*#players+20) --Depending on how many players there are, the leaderboard will adjust its size. The frame has ClipDescendants on, so when it shortens, the other lines are obscured.
		if #players > 1 then --If there is only one player, none of this is necessary.
			t = 1
			for i = 1, #players do
				if players[i].Name ~= player.Name then
					t = t + 1 --This is because we don't want a player's name to be inserted in the first line, as the main player already occupies it.
					line = script.Parent:FindFirstChild(t)
					line.Player.Text = " " ..players[i].Name
					stat = players[i]:FindFirstChild("Stats") --Doing the same as we did with the main player.
					if stat then
						level = stat.Level
						prestige = stat.Prestige
						if prestige.Value < 1 then
							line.Prestige.Image = ""
							line.Player.Position = UDim2.new(0, 0, 0, 0)
						else
							line.Player.Position = UDim2.new(0, 20, 0, 0)
							if prestige.Value >= 10 and level.Value >= 50 then
								line.Prestige.Image = gui.Prestige.Master.Value
							else
								findIcon2 = gui.Prestige:FindFirstChild(prestige.Value)
								if findIcon2 then
									line.Prestige.Image = findIcon2.Value
								end
							end
						end
						line.Level.Text = level.Value
					end
				end
			end
		end
	end
end

I've scanned through this script so many times and I've not been able to locate one instance of the script breaching past the Client spectrum. Based on what I have read about FilteringEnabled, this script should work perfectly. I really want to make my game as exploiter-free as possible, but by this point, I'm thinking about not using FilteringEnabled at all as it just doesn't make any sense to me why this isn't working.

Please help me figure out why this isn't working and make my headache go away ;-;