Clones to the hit.Parent, another player touches it, they get but other loses it, why?

local model = script.Parent
local toucher = model.Detector
local label = model.Display.SurfaceGui.Status
local screen = model.Display
local BillboardGui = Instance.new("BillboardGui")
local Text = Instance.new("TextBox")

local inuse = false

toucher.Touched:Connect(function(hit)
	if game.Players:GetPlayerFromCharacter(hit.Parent) and not inuse and not hit.Parent.Head:FindFirstChildOfClass("BillboardGui") then
		inuse = true
		local player = game.Players:GetPlayerFromCharacter(hit.Parent)
		for i = 0, 0 do
			label.Text = 'AUTHORIZING'
			label.TextColor3 = Color3.fromRGB(255, 239, 201)
			screen.Warning.PlaybackSpeed = 2.3
			script.Parent.Display.Color = Color3.fromRGB(255, 239, 201)
			model.Glow.Color = Color3.fromRGB(255, 239, 201)
			model.Glow.PointLight.Color = Color3.fromRGB(255, 239, 201)
			screen.Warning:Play()
			wait(0.3)
			label.Visible = false
			wait(0.65)
			label.TextColor3 = Color3.fromRGB(255, 239, 201)
			script.Parent.Display.Color = Color3.fromRGB(255, 239, 201)
			model.Glow.Color = Color3.fromRGB(255, 239, 201)
			model.Glow.PointLight.Color = Color3.fromRGB(255, 239, 201)
			label.Text = 'AUTHORIZING'
			screen.Warning.PlaybackSpeed = 2.3
			screen.Warning:Play()
			wait(0.3)
			label.Visible = false
			wait(0.65)
			screen.Stab:Play()
		end
		wait(1)
			label.Visible = true
			screen.Warning.PlaybackSpeed = 4
			label.TextColor3 = Color3.fromRGB(107, 255, 66)
			script.Parent.Display.Color = Color3.fromRGB(0, 255, 0)
			model.Glow.Color = Color3.fromRGB(0, 255, 0)
			model.Glow.PointLight.Color = Color3.fromRGB(0, 255, 0)
			----GUI
			label.Text = 'NANOCHIP INJECTED'
			BillboardGui.Name = "AuthorizeTag"
			BillboardGui.Parent = hit.Parent:WaitForChild("Head")
			BillboardGui.Active = true
			BillboardGui.Adornee = hit.Parent:WaitForChild("Head")
			BillboardGui.Size = UDim2.new(40, 40, 1, 1)
			BillboardGui.StudsOffset = Vector3.new(0, 3, 0)
			
			Text.Name = "Text"
			Text.Parent = BillboardGui
			Text.BackgroundColor3 = Color3.new(0, 0, 0)
			Text.BackgroundTransparency = 1
			Text.BorderColor3 = Color3.new(0, 0, 0)
			Text.Size = UDim2.new(1, 1, 0.699999988, 0)
			Text.ClearTextOnFocus = false
			Text.Font = Enum.Font.SourceSans
			Text.MultiLine = true
			Text.Text = "AUTHORIZED | " .. hit.Parent.Name
			Text.TextColor3 = Color3.new(0.517647, 1, 0)
			Text.TextScaled = true
			Text.TextSize = 14
			Text.TextStrokeColor3 = Color3.new(1, 1, 1)
			Text.TextWrapped = true
			Text.TextYAlignment = Enum.TextYAlignment.Top
			----GUI
			screen.Warning:Play()
			wait(0.25)
			screen.Warning:Play()
			wait(0.25)
			screen.Warning:Play()
		end
		wait(5)
		inuse = false
	end)

This is used to mark players, but whenever they touch it, a billboard gui gets created which is intended. But if I do it to someone else, the player who touched it before loses the tag, and the new player gets it. What's the problem?