Photon Multiplayer problem - both characters moving with one control

For some reason when I'm moving one of my characters the other character also moves together. Both seem to be controlled by either one of the opened games. I'm new to coding so I have no idea what is causing the problem.

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using Photon.Pun;
 
 public class Player : MonoBehaviourPunCallbacks
 {
 
     private Rigidbody2D myRigidbody;
 
     private Animator myAnimator;
 
     [SerializeField]
     private float movementSpeed;
 
     private bool facingLeft;
 
     private bool attack;
 
     [SerializeField]
     private Transform[] groundPoints;
 
     [SerializeField]
     private float groundRadius;
 
     [SerializeField]
     private LayerMask whatIsGround;
 
     private bool isGrounded;
 
     private bool jump;
 
     [SerializeField]
     private float jumpForce;
 
     [SerializeField]
     private bool airControl;
 
     void Start()
     {
         facingLeft = true;
         myRigidbody = GetComponent<Rigidbody2D>();
         myAnimator = GetComponent<Animator>();
     }
     
    
    
     
     void Update()
     {
         HandleInput();
     }
 
 
     void FixedUpdate()
     {
         float horizontal = Input.GetAxis("Horizontal");
 
 
         isGrounded = IsGrounded();
 
         HandleMovement(horizontal);
 
         Flip(horizontal);
 
         HandleAttacks();
 
         HandleLayers();
 
         ResetValues();
 
        
 
     }
 
 
 
 
 
     private void HandleAttacks()
     {
         if (attack && isGrounded &&!this.myAnimator.GetCurrentAnimatorStateInfo(0).IsTag("Attack"))
         {
             myAnimator.SetTrigger("attack");
             myRigidbody.velocity = Vector2.zero;
 
         }
 
     }
 
     private void HandleInput()
     {
         if (Input.GetKeyDown(KeyCode.Space))
         {
             jump = true;
         }
         
 
         if (Input.GetKeyDown(KeyCode.E))
         {
             attack = true;
 
         }
     }
 
     
 private void HandleMovement(float horizontal)
     {
         if (photonView.IsMine)
         {
 
         }
 
         if (myRigidbody.velocity.y < 0)
         {
             myAnimator.SetBool("land", true);
         }
         if (!this.myAnimator.GetCurrentAnimatorStateInfo(0).IsTag("Attack")&& (isGrounded || airControl))
         {
             myRigidbody.velocity = new Vector2(horizontal * movementSpeed, myRigidbody.velocity.y);
         }
         if (isGrounded && jump)
         {
             isGrounded = false;
             myRigidbody.AddForce(new Vector2(0, jumpForce));
             myAnimator.SetTrigger("jump");
         }
 
 
         
 
         myAnimator.SetFloat("speed", Mathf.Abs(horizontal));
     }
 
     private void Flip(float horizontal)
     {
         if (horizontal < 0 && !facingLeft || horizontal > 0 && facingLeft)
         {
             facingLeft = !facingLeft;
             
             Vector3 theScale = transform.localScale;
 
             theScale.x *= -1;
             transform.localScale = theScale;
 
         }
     }
    
     private void ResetValues()
     {
         attack = false;
         jump = false;
     }
 
     private bool IsGrounded()
     {
         if (myRigidbody.velocity.y <= 0)
         {
             foreach (Transform point in groundPoints)
             {
                 Collider2D[] colliders = Physics2D.OverlapCircleAll(point.position, groundRadius, whatIsGround);
 
                 for(int i = 0; i < colliders.Length; i++)
                 {
                     if (colliders[i].gameObject != gameObject)
                     {
                         myAnimator.ResetTrigger("jump");
                         myAnimator.SetBool("land", false);
                         return true;
                     }
                 }
 
             }
         }
         return false;
     }
 
     private void HandleLayers()
     {
         if (!isGrounded)
         {
             myAnimator.SetLayerWeight(1, 1);
         }
         else
         {
             myAnimator.SetLayerWeight(1, 0);
         }
     }
 }

Any help is appreciated. There are no apparent error codes so I'm more clueless as to how to proceed.