Scriptable object not referencing speed but references damage...

So I have 2 variable of Speed and Damage in a scriptable object.

Here is the code for the first section :-

 [CreateAssetMenu(fileName = "BulletData", menuName = "Data/Bullet")]
 public class BulletDataScriptableObject : ScriptableObject
 {
     public float speed = 5f;
     public int damage = 30;
 } 
 

I then have a prefab object referencing this to fire a 'FireBall' which is utilising the following code :-

 > using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.UI;
 
 public class PlayerProjectiles : MonoBehaviour
 {
     public Animator animator;
     public BulletDataScriptableObject bulletData;
     public float speed;
     public int damage;
     public Rigidbody2D rb;
     public GameObject FireEmbers;
     public float liveTime = 1f;
     
     void Start()
     {
         
         rb.velocity = transform.right * speed;
         speed = bulletData.speed;
         damage = bulletData.damage;
     }
 
     void OnTriggerEnter2D(Collider2D hitInfo)
 
     {
         Enemy enemy = hitInfo.GetComponent<Enemy>();
         if (enemy != null)
         {
             enemy.TakeDamage(damage);
         }
 
         Destroy(gameObject);
         Instantiate(FireEmbers, transform.position, Quaternion.identity);
 
     }
 
     void Update()
     {
         liveTime -= Time.deltaTime;
         if (liveTime <= 0)
         {
             Destroy(this.gameObject);
             Instantiate(FireEmbers, transform.position, Quaternion.identity);
         }
     }
 }

Here's the problem. For some reason my fireball will reference the damage variable but not the speed so when I fire the fireball it doesn't go anywhere unless I manually enter the speed variable in the Unity inspector, damage however it references fine and if I stand point blank at an enemy the fireball will damage them at the right amount. My item power-ups also damage them at the amended power level so I am confused as to why it's not referencing the speed variable.

@Aviryx If you can help again then I officially owe you a beer or something!