Position set way off / Different coordinate system problem

I'm beginning to make a game and I've encountered a small problem. I know this may be related to Unity's different coordinate system but please help, I'm new to this. Here's my simple script:

 using UnityEngine;
 using System.Collections;
 
 public class Players : MonoBehaviour {
 
     public GameObject player1;
     public GameObject player2;
     private Rigidbody2D rb1;
     private Rigidbody2D rb2;
 
     void Start () {
         rb1 = player1.GetComponent<Rigidbody2D> ();
         rb2 = player2.GetComponent<Rigidbody2D> ();
     }
 
     void Update () {
     
         foreach (Touch t in Input.touches) {
             if (t.position.x > Screen.width / 2) {
                 rb1.position=(new Vector2(rb1.position.x,t.position.y));
             } else {
                 rb2.position=(new Vector2(rb2.position.x,t.position.y));
             }
         }
 
     }
 }

It does half of what it's supposed to do when I test it in Unity Remote on my phone. The players are moved accordingly, meaning they stay on the same X coordonate and the Y changes,but they go WAY off the camera screen, the Y is way too big. I expected the touch position on the phone to be similar to the position on the camera, if that makes sense. How can this difference in coordinate system be solved?