Enemy bullets pass through my walls

I've been wanting to make a retro fps game for a long time and now, I finally have time to start it, so i looked up on the internet for tutorials to start understanding its mechanics and I found a whole series containing everything I needed to know. After following it very closely, everything seems to work but one thing. My enemies shoot bullets, those bullets have a 2D circle collider which acts as a trigger, and a rigidbody 2D set to kinematic. My walls have 2D box colliders and yet those bullets pass through the walls like they were nothing!

Here are a couple of screenshots of my scripts and editor:

This is the inspector for my bullet game object:

This is the inspector for my bullet game object's child:

and this is my bullets script:

//Beginning of script// public int damageAmount; public float bulletSpeed = 3f; public Rigidbody2D theRB; private Vector3 direction;

 // Start is called before the first frame update
 void Start()
 {
     direction = PlayerController.instance.transform.position - transform.position;
     direction.Normalize();
     direction = direction * bulletSpeed;
 }

 // Update is called once per frame
 void Update()
 {
     theRB.velocity = direction * bulletSpeed;
 }

 private void OnTriggerEnter2D(Collider2D other){
     if(other.tag == "Player"){
         PlayerController.instance.TakeDamage(damageAmount);
         Destroy(gameObject);
     }

 }