Jumping and shooting knocks character off balance

Unity Engine
1

Whenever I start shooting, everything works out fine (the bullets come out, they go in a certain direction.) But for some reason when my character is in the air and fires, the bullet seems to hit him and he starts spinning.

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

public class BulletCtrl : MonoBehaviour {

    public Vector2 bulletspeed;

    [SerializeField]
    private float delay;
    Collider2D myCollider;
    Rigidbody2D rb2d;
    Collider2D coll;
    // Use this for initialization
    void Start () 
    {
        coll = GameObject.FindGameObjectWithTag ("Player").GetComponent<Collider2D> ();
        myCollider = GetComponent<Collider2D> ();
       
        rb2d = GetComponent<Rigidbody2D> ();
        rb2d.velocity = bulletspeed;
        Destroy (gameObject, delay);
    }
   
    // Update is called once per frame
    void Update () 
    {
        rb2d.velocity = bulletspeed;
        Physics2D.IgnoreCollision(coll, myCollider, true);


    }


}

Thanks for taking a look at my problem.

2

Do the IgnoreCollision in Start or Awake. You only have to call it once.

3

After doing that, the bullet still seems to collide with the character.

EDIT: I got it working somehow, but I’m not really sure how.