My Player doesn't move anymore. I didn't change a thing in the script and it did work before. What's wrong?

I'm making a 2D game and so far everything worked. But all of a sudden, today, my Player wouldn't move anymore. I didn't change anything that the player had. Here is 'Player.cs': using System.Collections; using System.Collections.Generic; using UnityEngine; using UnityEngine.UI; using UnityEngine.SceneManagement;

 [RequireComponent(typeof(PlayerMovement))]
 [RequireComponent(typeof(Animator))]
 public class Player : MonoBehaviour
 {
     [SerializeField]
     private PlayerMovement pm;
     private Animator anim;
     private SpriteRenderer rend;
     private PlayerCombat pc;
     
     public int health = 5;
     public int exp = 0;
     
     public int currentEnemyCount;
 
     public float speed;
     public float walkSpeed = 5f;
     public float runSpeed = 10f;
     public float jumpSpeed = 7f;
     
     public bool isGrounded;
 
     void Start()
     {
         pm = GetComponent<PlayerMovement>();
         anim = GetComponent<Animator>();
         rend = GetComponentInChildren<SpriteRenderer>();
         pc = GetComponentInChildren<PlayerCombat>();
         
         Physics.IgnoreLayerCollision(10, 10, true);
     }
 
     void Update()
     {
         //Movement speed:
         if(Input.GetKey(KeyCode.LeftShift))
         {
             speed = runSpeed;
         }
         else
         {
             speed = walkSpeed;
         }
 
         if(GameObject.Find("DialogManager").GetComponent<DialogManager>().GetActiveSelf() == false)
         {
             Movement();
             
             //Jumping:
             if(Input.GetKeyDown(KeyCode.Space) && isGrounded == true)
             {
                 Debug.Log("Jumping...");
                 pm.Jump(jumpSpeed);
             }
         }
         
         //Escape to main menu:
         if(Input.GetKeyDown(KeyCode.Escape))
         {
             //Make sure main menu is always scene number 0!!!
             SceneManager.LoadScene(0);
         }
     }
 
     void Movement()
     {
         float xMov = Input.GetAxis("Horizontal");
         float zMov = Input.GetAxis("Vertical");
         
         if(xMov != 0 || zMov != 0)
         {
             anim.SetBool("Moving", true);
         }
         else
         {
             anim.SetBool("Moving", false);
         }
         
         if(xMov < 0)
         {
             rend.flipX = true;
         }
         else if(xMov > 0)
         {
             rend.flipX = false;
             Debug.Log("Moving right");
         }
 
         Vector2 movHorizontal = transform.right * xMov;
         Vector2 movVertical = transform.forward * zMov;
 
         Vector2 velocity = (movHorizontal + movVertical) * speed;
 
         pm.MoveHorizontal(velocity);
     }
     
     public void ApplyDamage(int damage)
     {
         health -= damage;
         if(health <= 0)
         {
             KillYourself();
         }
         else if(health == 1)
         {
             rend.color = Color.red;
         }
         else
         {
             Respawn();
         }
     }
     
     public void GainExperiencePoints(int points)
     {
         exp += points;
     }
     
     public void CountEnemy()
     {
         currentEnemyCount--;
         
         if(currentEnemyCount <= 0)
         {
             CompleteLevel(-1);
         }
     }
     
     public void CompleteLevel(int nextLevel)
     {
         Debug.Log("Level Complete!");
         
         Scene currentScene = SceneManager.GetActiveScene();
         
         if(nextLevel == -1)
         {
             nextLevel = currentScene.buildIndex + 1;
         }
         
         SceneManager.LoadScene(nextLevel);
     }
     
     void KillYourself()
     {
         Destroy(gameObject);
         GameObject HUD = GameObject.Find("HUDManager");
         HUD.GetComponent<HUDManager>().ActivateDeathScreen();
     }
     
     void Respawn()
     {
         transform.position = new Vector2(0, 1);
     }
     
     void OnCollisionEnter2D(Collision2D collision)
     {
         GameObject obj = collision.gameObject;
         if(obj.tag == "KillZone")
         {
             ApplyDamage(1);
         }
         else if(obj.tag == "ThrowablePickup")
         {
             pc.currentAmmo++;
         }
     }
     
     void OnCollisionStay2D(Collision2D collision)
     {
         GameObject obj = collision.gameObject;
         if(obj.layer == 8)
         {
             isGrounded = true;
         }
     }
     
     void OnCollisionExit2D(Collision2D collision)
     {
         GameObject obj = collision.gameObject;
         if(obj.layer == 8)
         {
             isGrounded = false;
         }
     }
 }

And here is 'PlayerMovement.cs':

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 [RequireComponent(typeof(Rigidbody2D))]
 public class PlayerMovement : MonoBehaviour
 {
     [SerializeField]
     private Player player;
     private Rigidbody2D rb;
     
     void Start()
     {
         player = GetComponent<Player>();
         rb = GetComponent<Rigidbody2D>();
         rb.constraints = RigidbodyConstraints2D.FreezeRotation;
     }
     
     public void MoveHorizontal(Vector2 _velocity)
     {
         rb.MovePosition(rb.position + _velocity * Time.fixedDeltaTime);
     }
     
     public void Jump(float _thrust)
     {
         rb.AddForce(new Vector2(0, _thrust));
     }
 }

This code worked for me before, but it suddenly didn't. And I also have a sword that glitches: it flashes in two spots and moves weird. I put a script on it to follow the player:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 [RequireComponent(typeof(PlayerCombat))]
 public class PlayerWeapon : MonoBehaviour 
 {
     public float weaponDamage = 10f;
     
     public float offSetX;
     public float offSetY;
     
     private GameObject player;
     
     void Start()
     {
         player = GameObject.FindWithTag("Player");
         Physics2D.IgnoreCollision(player.GetComponent<Collider2D>(), GetComponent<Collider2D>());
     }
     
     void Update()
     {
         float xaxis = player.transform.position.x;
         float yaxis = player.transform.position.y;
         transform.position = new Vector2(xaxis + offSetX, yaxis + offSetY);
         //0.35f, 0.03f
     }
     
     void OnCollisionEnter2D(Collision2D collision)
     {
         GameObject obj = collision.gameObject;
         
         if(obj.tag == "Enemy")
         {
             Debug.Log("Hit enemy!");
             obj.SendMessage("ApplyDamage", weaponDamage);
         }
     }
 }