Targeting system is off and targets the newest found enemy?

Hello this might be a bit complicated and I'm not that very good at math so I had to follow tutorials obviously anyways I'm making a tower defense game and my targeting codes makes the towers target the newest found enemy instead of the enemy in front of all the other zombies.

I saw nothing about this since tower defense games are very uncommon in Roblox so I would like help!

local tower = script.Parent

local level = tower.Level

local damage = tower.Damage.Value

local firerate = tower.Firerate.Value / 10

local range = tower.Range.Value

local candetect = tower.CanDetect.Value

while true do
    wait(firerate)

    level = tower.Level

    damage = tower.Damage.Value

    firerate = tower.Firerate.Value / 10

    range = tower.Range.Value

    candetect = tower.CanDetect.Value

    local target = nil
    local humanoid = nil

    for i, v in pairs(workspace.Zombies:GetChildren()) do -- Makes a loop checking for the enemies in the zombies folder
        if candetect == true then -- detects if hidden detection is on
            humanoid = v:FindFirstChild("Enemy") or v:FindFirstChild("Hidden") -- if it's on then set targeting to zombies with humanoids named: "Enemy" or "Hidden"
        elseif candetect == false then
            humanoid = v:FindFirstChild("Enemy") -- if it's off then set targeting to zombies with humanoids named: "Enemy"
        end
        local torso = v:FindFirstChild("Torso") -- gets the torso of the enemy so it can create bullets to do damage

        if humanoid and torso and humanoid.Health > 0 then -- checks if enemy has a humanoid a torso and has health above 0
            if (torso.Position - tower.HumanoidRootPart.Position).magnitude <= range then -- range calculation
                target = torso -- sets the target
            end
        end
    end

    if target then
        local torso = target

        tower.Sound:Play()
        tower:SetPrimaryPartCFrame(CFrame.new(tower.HumanoidRootPart.Position, Vector3.new(target.Position.X, target.Position.Y, target.Position.Z)))
        local bullet = game.ReplicatedStorage:FindFirstChild("Bullet"):Clone()
        bullet.Damage.Value = damage
        bullet.Parent = workspace
        bullet.Position = target.Position
    end
end

Yes thats my code for how the towers are being handled (seperate script for handling upgrades)