AI Character not rotating when spawned in

To give you some background, I have a button which spawns a prefab wherever I click/touch afterward to place it down. After that, I have a simple wandering script that changes direction every 3 seconds and travels forward using it's character controller.

The problem, however, is that if I drag the prefab into the editor and press play, the little fella moves fine, but if I use the button to spawn it in-game, it will only move forward, never turning. This is the script I use:

 using UnityEngine;
 using System.Collections;
  
 [RequireComponent(typeof(CharacterController))]
 public class Wander : MonoBehaviour {
     public float velocityMax;
   
     private float x;
     private float z; 
     private float time;
     private float angle;
     public bool isTouchWall;
  
     // Use this for initialization
     void Start () { 
         x = Random.Range(-velocityMax, velocityMax);
         z = Random.Range(-velocityMax, velocityMax);
         angle = Mathf.Atan2(x, z) * (180 / 3.141592f) + 90;
         transform.rotation = Quaternion.Euler( 0, angle, 0);
         
         animation.wrapMode = WrapMode.Loop;
         animation.Play("walk");
         isTouchWall = false;
         
     }
     
     void OnCollisionStay(Collision collisionInfo) {
         foreach (ContactPoint contact in collisionInfo.contacts) {
             if (contact.otherCollider.gameObject.tag.Equals("Barrier")) {
                 isTouchWall = true;    
             }
         }
     }
  
     // Update is called once per frame
     void Update () {
          if (Time.timeScale >= 1) {
             time += Time.deltaTime; 
         
             if (time > 3.0f) {
                 x = Random.Range(-velocityMax, velocityMax);
                 z = Random.Range(-velocityMax, velocityMax);
                 angle = Mathf.Atan2(x, z) * (180 / 3.141592f) + 90;
                 
                 if (isTouchWall == true) { 
                     if (angle + 180 < 360)
                         angle += 180;
                     else
                         angle -= 180;
                     
                     isTouchWall = false;
                 }
                 
                 transform.rotation = Quaternion.Euler(0, angle, 0);
                 time = 0.0f;
                 Debug.Log("turn");
             }
             
             Vector3 forward = transform.TransformDirection(Vector3.forward);
             gameObject.GetComponent<CharacterController>().SimpleMove(forward * velocityMax); 
         }
     }
 }