Hello, I'm a beginner on the unity platform and I've made a simple script movement that jumps and walks perfectly, therefore, when it touches a wall, it sticks to it, and not falling down. How can I fix this?

Video:

https://reddit.com/link/110p1xr/video/h0fg72ltetha1/player

Code:

using UnityEngine;
public class PlayerMovement : MonoBehaviour
{
    public float _speed;
    public float _jumpForce;
    private Rigidbody _rig;
    private Vector2 _input;
    private Vector3 _movementVector;
    private void Start()
    {
        _rig = GetComponent<Rigidbody>();
    }
    private void Update()
    {
        _input = new Vector2(Input.GetAxis("Horizontal"), Input.GetAxis("Vertical"));
        if (Input.GetButtonDown("Jump") && IsGrounded())
        {
            _rig.AddForce(Vector3.up * _jumpForce, ForceMode.Impulse);
        }
    }
    private void FixedUpdate()
    {
        //Keep the movement vector aligned with the player rotation
        _movementVector = _input.x * transform.right * _speed   _input.y * transform.forward * _speed;
        //Apply the movement vector to the rigidbody without effecting gravity
        _rig.velocity = new Vector3(_movementVector.x, _rig.velocity.y, _movementVector.z);
    }
    private bool IsGrounded()
    {
        if (Physics.Raycast(transform.position, Vector3.down, 1.75f))
        {
            return true;
        }
        else
        {
            return false;
        }
    }
}

Pictures:

https://preview.redd.it/axgbxpl9ftha1.png?width=545&format=png&auto=webp&s=c6464a8ba11b040780b96c593d2c83754abde671