FPS rigidbody problem

Hi guys

I'm creating a FPS and I have the following issue:

When I shoot at the characters, sometimes the hit is not recognized even if the player is in front of them.

They have a box collider and a rigidbody attached to them.

I have this script attached to the player:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class DisparaArma : MonoBehaviour
 {
     private GerenciaArma gerenciaArma;
 
     public float nDisparo = 15f;
     private float TempoProximoDisparo;
     public float damage = 20f;
 
     private Animator ZoomCameraIn;
     private bool zoomed;
 
     private Camera Maincamera;
     private GameObject mira;
     // Start is called before the first frame update
     void Start()
     {
         gerenciaArma = GetComponent<GerenciaArma>();
         ZoomCameraIn = transform.Find(Tags.LOOK_ROOT).transform.Find(Tags.ZOOM_CAMERA).GetComponent<Animator>();
 
         mira = GameObject.FindWithTag(Tags.MIRA);
         Maincamera = Camera.main;
     }
 
     // Update is called once per frame
     void Update()
     {
         Atira();
         ZoomInAndOut();
     }
 
     void Atira()
     {
         if (Input.GetMouseButtonDown(0))
         {
             if(gerenciaArma.SelecionaArma().tipoBala == WeaponBulletType.BULLET)
             {
                 gerenciaArma.SelecionaArma().AnimacaoTiro();
                 DisparaBala();
                 
                 
             }
             
         }
     }
 
     void ZoomInAndOut()
     {
         if (gerenciaArma.SelecionaArma().mira_tipo == TipoMira.AIM)
         {
             if (Input.GetMouseButtonDown(1))
             {
                 ZoomCameraIn.Play(Animacoes.ZOOM_IN_ANIM);
                // gerenciaArma.SelecionaArma().Aim(true);
                 mira.SetActive(false);
                 print("VaiZoom");
             }
 
             if (Input.GetMouseButtonUp(1))//se soltar o botão do mouse
             {
                 ZoomCameraIn.Play(Animacoes.ZOOM_OUT_ANIM);
                 //gerenciaArma.SelecionaArma().Aim(false);
                 mira.SetActive(true);
             }
         }
     }
 
     void DisparaBala()
     {
         RaycastHit hit;
         if(Physics.Raycast(Maincamera.transform.position, Maincamera.transform.forward, out hit))
         {
             
             if (hit.transform.tag == Tags.ENEMY_TAG)
             {
                 hit.transform.GetComponent<ScriptVida>().DanoAplicado(damage);
             }
         }
     }
 }
 

and this one is attached to the enemies:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.AI;
 
 public class ScriptVida : MonoBehaviour
 {
     private IndioAnimações indio_Anim;
     private NavMeshAgent navAgent;
     private IndioController indio_Controller;
 
     public float vida = 100f;
     public bool is_Player, is_Indio, is_Onca;
 
     private bool morto;
     // Start is called before the first frame update
     void Awake()
     {
         if (is_Onca || is_Indio)
         {
             indio_Anim = GetComponent<IndioAnimações>();
             indio_Controller = GetComponent<IndioController>();
             navAgent = GetComponent<NavMeshAgent>();
         }
 
         if (is_Player)
         {
 
         }
     }
 
     public void DanoAplicado(float damage)
     {
         if (morto)
             return;
         vida -= damage;
 
 
         if (is_Player)//mostra a barra de vida do jogador sendo decrementada
         {
 
         }
 
         if (is_Onca || is_Indio)
         {
             if (indio_Controller.EnemyState == EnemyState.PATROL)
             {
                 indio_Controller.chase_Distance = 50f;
             }
         }
 
         if (vida <= 0)
         {
             JogadorMorre();
             morto = true;
             print(vida);
         }
 
     }
 
     void JogadorMorre()
     {
         if (is_Indio)//se o jogador mata o indio
         {
             GetComponent<Animator>().enabled = false;
             GetComponent<BoxCollider>().isTrigger = false;
             GetComponent<Rigidbody>().AddTorque(-transform.forward * 50f);
 
             indio_Controller.enabled = false;
             navAgent.enabled = false;
             indio_Anim.enabled = false;
         }
 
         if (is_Onca)// se o jogador mata a onça
         {
             GetComponent<Animator>().enabled = false;
             GetComponent<BoxCollider>().isTrigger = false;
             GetComponent<Rigidbody>().AddTorque(-transform.forward * 50f);
 
             indio_Controller.enabled = false;
             navAgent.enabled = false;
             indio_Anim.enabled = false;
         }
 
         if (is_Player)
         {
             GameObject[] enemies = GameObject.FindGameObjectsWithTag(Tags.ENEMY_TAG);
             for (int i = 0; i < enemies.Length; i++)
             {
                 enemies[i].GetComponent<IndioController>().enabled = false;
             }
 
             GetComponent<Movimentação>().enabled = false;
             GetComponent<DisparaArma>().enabled = false;
             GetComponent<GerenciaArma>().SelecionaArma().gameObject.SetActive(false);
         }
 
         if (tag == Tags.PLAYER_TAG)//caso o jogador morra, o jogo é reiniciado
         {
             Invoke("RestartGame", 3f);
         }
 
         else
         {
             Invoke("TurnOffGameObject", 3f);
         }
     }
 
     void RestartGame()//função para reiniciar o jogo caso o jogador morra
     {
         UnityEngine.SceneManagement.SceneManager.LoadScene("Gameplay");
     }
 
     void TurnOffGameObject()
     {
         gameObject.SetActive(false);
     }
 
 }

What could I do to solve this problem?

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