Timer gets added random values when event is fired

[InterCreation]

local function startTimer()
	while true do
		currentTime -= 1
		label.Text = formatTime()
		
		Addtime.Event:Connect(function()
			currentTime += 2
		end)
		
		if currentTime <= 30 then
			label.TextColor3 = Color3.new(1, 0, 0.0156863)
		end
		
		if currentTime <= 10 then
			game:GetService("SoundService").Beep:Play()
		end
		
		if currentTime <= 0 then
			char.Humanoid.Health = 0
			game:GetService("SoundService").Beep:Stop()
			label.Parent:Destroy()
			label:Destroy()
			break
			
		end

		task.wait(1)
	end
end

startTimer()