Why isn't a point being added to the leader board?

In this instance do not use connection:Disconnect because it stops the function.

ball = script.Parent
damage = 50
local debounce = true
function onTouched(hit)


    local humanoid = hit.Parent:findFirstChild("Humanoid")
    if humanoid~=nil then
        tagHumanoid(humanoid)
        humanoid.Health = humanoid.Health - damage
        if debounce then
            debounce = false
            if humanoid.Health == 0 or humanoid.Health < 0 then
                local z = game.Players:FindFirstChild(game.ReplicatedStorage.asd.Value)
                z.leaderstats.Kills.Value += 1
                wait(2)
                debounce = true
            end
        end

        untagHumanoid(humanoid)
    else
        damage = damage / 2
        if damage < 2 then
            ball.Parent = nil
        end
    end

don't use connection:Disconnect() on this situation, if it dont have lines it doesnt run anything, connection:Disconnect() only stops the function and it's unable to get listened, basically disable the function

Heres a very cool explanation by roblox:

Always call Disconnect() when a connection is no longer needed. Forgetting to do so can cause your game to use more resources than necessary. Note, however, that this may not always be necessary; when an object is destroyed, all connections to that object’s events are disconnected automatically.