Child sprite jittering/vibrating when parent is moving and child is actively rotating (With video)

Video: https://www.youtube.com/watch?v=5fBnwgDycwI If you look at the rotation in the inspector u can see the value change even tho, it theoretically should be constant when movement direction is constant and mouse pos is constant

Here are the scripts that affect t$$anonymous$$s

 private void update()
 {
 moveDelta = new Vector3(movementInput.x, movementInput.y, 0).normalized;
 }
  
 private void FixedUpdate()
 {
 rb.velocity = moveDelta * moveSpeed;
 }
  
  
  
  
 public class LookAtMouse : MonoBehaviour
 {
     private InputHandler inputHandler;
     private float angle;
  
     void Start()
     {
         inputHandler = GetComponentInParent<InputHandler>();
     }
  
     private void Update()
     {
         Vector2 weaponDirection = (inputHandler.mouseWorldPos - transform.position).normalized;
         angle = Mathf.Atan2(weaponDirection.y, weaponDirection.x) * Mathf.Rad2Deg;
         transform.eulerAngles = new Vector3(0, 0, angle);
     }
  
  
 }
 
    private void OnGUI()
     {
         mousePos = Mouse.current.position.ReadValue();
        
             //Camera.main.nearClipPlane;
         mouseWorldPos = mainCamera.ScreenToWorldPoint(mousePos);
         mouseWorldPos.z = 0;
 
               
     }

Right now I was using OnGUI() just to see if it helped, it didn't. I have tried all kinds of combinations of update, lateudpate ,fixedupdate. I changed script execution order but I can't get it to work

Any ideas or solutions would be greatly appriciated!