How do I ensure my TouchEnded event is only triggered legitimately?

I have the following code:

local ids = {}

local function hasValue(tab, value)
	local contains = nil
	for k,v in pairs(tab) do
		if v == value then
			contains = k
			break;
		end
	end
	return contains
end

script.Parent.Detector.Touched:connect(function(obj)
	if obj.Name == "HumanoidRootPart" then
		local player = game.Players:GetPlayerFromCharacter(obj.Parent)
		if player then
			if hasValue(ids, player.UserId) == nil then
				print(player.UserId, "is here")
				table.insert(ids, player.UserId)
			end
		end
	end
end)

script.Parent.Detector.TouchEnded:connect(function(obj)
	if obj.Name == "HumanoidRootPart" then
		local player = game.Players:GetPlayerFromCharacter(obj.Parent)
		if player then
			local k = hasValue(ids, player.UserId)
			if k ~= nil then
				print(player.UserId, "left")
				ids[k] = nil
			end
		end
	end
end)

It all works fine and dandy, the players UserId stays in the table until they leave the part... At least while they are in third person. As soon as they are in first person, and move or turn even the smallest amount, they constantly trigger the TouchEnded and Touched event. This ruins what I'm using this for, and so I need a way around it. How would I go about fixing this?