Problem after collision2D ?

Hello

I'm having a problem that I don't know how can I solved.

In my game, I have some holes, when my player down on hole his return to first position.

After this is happen my player stay crazy, his lost position, animator, collisions, everything and I don't know how can I solve this problem and why it happens

look at problem in this video: https://www.youtube.com/watch?v=eH_vY4PhaJg

 public class CanyonControl : MonoBehaviour {
 
 
     public Transform player;
     private Vector3 playerPosition;
 
     // Use this for initialization
     void Start () {
         playerPosition = player.position;    
     }
     
     // Update is called once per frame
     void Update () {
     
     }
 
     void OnCollisionEnter2D(Collision2D coll){
         if(coll.gameObject.name.Equals("PlayerObject")){
            player.position = playerPosition;           
         }
     }
 }