Issue with RaycastHit2D and object collider

Hello, I'm pretty new with raycasting in Unity.
I was working on a grid base movement for a 2D game and I tryed to write a test code to figure out how to predict if in the next "cell" of the grid there would be a block with a BoxCollider2D attached (like a wall).
The code I wrote works fine but when the Player moves sometimes return a raycast collision that doesn't exist with objects placed at different global coordinates.
I can't find any fixes to this problem and I don't know where I'm wrong, if someone can help me I'll be very grateful, thank you.

The script needs to be attached to a empty GameObject with only a RigidBody2D set to "Dynamic", "Gravity Scale = 0" and Freeze Rotation enabled.
The Player moves by 1U per axis Input and the box colliders, of the Objects (like the walls), needs to be size of 1 by 1.
I'm using Unity 3D 2019.2.9f1

"Player" script:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;

 public class Player : MonoBehaviour
 {
     public Vector2 nextPosition;
     public Vector2 targetPosition;
 
     public float movementSpeed = 10.0f;
 
     private Rigidbody2D rb2D;
     private BoxCollider2D bc2D;
     private bool isAxisInUse; 
 
     void Start()
     {
         rb2D = GetComponent<Rigidbody2D>();
         //bc2D = GetComponent<BoxCollider2D>();
         isAxisInUse = false;
 
         targetPosition = new Vector2(rb2D.position.x, rb2D.position.y);
         nextPosition = new Vector2(rb2D.position.x, rb2D.position.y);
     }
 
     void FixedUpdate()
     { 
         if (Input.GetAxisRaw("Horizontal") != 0 || Input.GetAxisRaw("Vertical") != 0)
         {
             if (Input.GetAxisRaw("Horizontal") > 0 && isAxisInUse == false)
             {
                 isAxisInUse = true;
                 nextPosition = nextPosition + new Vector2(1, 0); //set the next position where the Player wants to move
             }
             else if (Input.GetAxisRaw("Horizontal") < 0 && isAxisInUse == false)
             {
                 isAxisInUse = true;
                 nextPosition = nextPosition - new Vector2(1, 0);
             }
 
             if (Input.GetAxisRaw("Vertical") > 0 && isAxisInUse == false)
             {
                 isAxisInUse = true;
                 nextPosition = nextPosition + new Vector2(0, 1);
             }
             else if (Input.GetAxisRaw("Vertical") < 0 && isAxisInUse == false)
             {
                 isAxisInUse = true;
                 nextPosition = nextPosition - new Vector2(0, 1);
             }
         }
         else isAxisInUse = false;
 
         RaycastHit2D hit = Physics2D.Raycast(nextPosition, nextPosition); //spawn raycast inside the "nextPosition" grid.
         if (hit.collider != null) //if a raycast hits a collider
         {
             Debug.Log("Collider at " + hit.point + " " + hit.collider.name);
             nextPosition = targetPosition; //set "nextPosition" as the current position of the Player -> the player won't move
         }
         else
         {
             targetPosition = nextPosition; //update the target position for the Vector2.MoveTowards
             rb2D.position = Vector2.MoveTowards(transform.position, targetPosition, Time.deltaTime * movementSpeed); //move the rb2d towards the target position
         }
     }
 }