Mathf.clamp cancels my trigger

Hey guys so I have a mathf.clamp canceling my trigger code. So in my game I have enemy objects that are suppose to be destroyed by my Mesh Collider trigger when my ship comes in contact with them. However what I found out is my Clamp code is canceling my OnTriggerEnter game code.

My clamp code makes it so I cant leave the play area.

Things to know: all the objects are level with each other. And my mesh collider is checked as "Is Trigger"

As seen below: ![alt text][1]

Here is my code also:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 [System.Serializable]
 public class Boundary
 {
     public float xMin, xMax, zMin, zMax; 
 }
 public class PlayerController : MonoBehaviour {
 
     public GameObject shot;
     public Transform shotSpawn;
     public float fireRate;
 
     public Boundary boundary;
 
     private Rigidbody rb;
     private AudioSource audioFire;
     private float nextFire;
 
     void Awake()
     {
         audioFire = GetComponent<AudioSource>();
         rb = GetComponent<Rigidbody>();
     }
 
     void Update()
     {
         if (Input.GetMouseButtonDown(0) && Time.time > nextFire)
         {
             nextFire = Time.time + fireRate;
             Instantiate(shot, shotSpawn.position, shotSpawn.rotation);
             audioFire.Play();
         }
     }
 
     void FixedUpdate()
     {
         rb.position = new Vector3
             (Mathf.Clamp(rb.position.x, boundary.xMin, boundary.xMax),
             0.0f,
             Mathf.Clamp(rb.position.z, boundary.zMin, boundary.zMax));
     }
 }

Player destroy enemies code:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.UI;
 
 
 public class PlayerResource : MonoBehaviour {
     public int PlayerHP;
     public int PlayerShield;
     public Slider Health;
 
     // Use this for initialization
     void Start () {
         PlayerHP = 100;
         PlayerShield = 0;
        
     }
     
     // Update is called once per frame
     void Update () {
        
     }
      void OnTriggerEnter(Collider other)
     {
         if (other.gameObject.name == "Meteor(Clone)") {
             PlayerHP = PlayerHP - 5;
             Health.value = PlayerHP;
 
         }
         else if (other.gameObject.name == "enemyFireball(Clone)")
         {
             Destroy(other.gameObject);
             PlayerHP = PlayerHP - 25;
             Health.value = PlayerHP;
         }
         else if (other.gameObject.name == "Meteor2(Clone)")
         {
             Destroy(other.gameObject);
             PlayerHP = PlayerHP - 5;
             Health.value = PlayerHP;
         }
         else if (other.gameObject.name == "RegularSpider(Clone)")
         {
             Destroy(other.gameObject);
             PlayerHP = PlayerHP - 10;
             Health.value = PlayerHP;
         }
         else if (other.gameObject.name == "MutatingSpider(Clone)")
         {
             Destroy(other.gameObject);
             PlayerHP = 0;
             Health.value = PlayerHP;
         }
        else if(other.gameObject.name == "Debris(Clone)")
             {
                 PlayerHP = PlayerHP - 5;
                 Health.value = PlayerHP;
             }
         //-------------------------------------------------------------------------       
        
     }
 }
 

SO why is my clamp code affecting the mesh collider and what are some solutions to get my code working? [1]: /storage/temp/95372-capture.png