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?