Grabbing a cube makes it expand and increase in size.

I have a cube in a game which I can grab and drop. The code below to do so works fine in that I can grab and drop the cube (with a key trigger or with a Touch controller). But every time I grab the cube, it's like it's being "stretched" and it increases in size to become a bigger cube, which I don't want to happen. I have executed this code before without this problem in a different project but now I can't figure out why the code to grab an object "stretches" its size and increases its volume. The cube is a rigid body with a box collider around it. Any help appreciated!

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class Grab_supermrkt : MonoBehaviour
 {
 
 
     public OVRInput.Controller controller;
     public string buttonName;
 
     public float grabRadius;
     public LayerMask grabMask;
 
     private GameObject grabbedObject;
     private bool grabbing;
 
     void GrabObject()
     {
 
         grabbing = true;
         RaycastHit[] hits;
         hits = Physics.SphereCastAll(transform.position, grabRadius, transform.forward, 0f, grabMask);
 
         if (hits.Length > 0)
         {
             int closestHit = 0;
 
             for (int i = 0; i < hits.Length; i++)
             {
                 if (hits[i].distance < hits[closestHit].distance) closestHit = i;
 
             }
 
             grabbedObject = hits[closestHit].transform.gameObject;
             grabbedObject.GetComponent<Rigidbody>().isKinematic = true;
             grabbedObject.transform.position = transform.position;
             grabbedObject.transform.parent = transform;
         }
     }
 
     void DropObject()
     {
         grabbing = false;
         if (grabbedObject != null)
         {
             grabbedObject.transform.parent = null;
             grabbedObject.GetComponent<Rigidbody>().isKinematic = false;
             grabbedObject.GetComponent<Rigidbody>().velocity = 2 * (OVRInput.GetLocalControllerVelocity(controller));
             grabbedObject.GetComponent<Rigidbody>().angularVelocity = OVRInput.GetLocalControllerAngularVelocity(controller);
             grabbedObject = null;
         }
     }
     // Update is called once per frame
     void Update()
     {
 
         if (!grabbing && Input.GetAxis(buttonName) == 1)
         {
             GrabObject();
         }
       
             if (grabbing && Input.GetAxis(buttonName) < 1)
             {
                 DropObject();
 
             }
     }
 }