Need help with an AI aiming system

Unity Engine
,
1

For some reason I had this same script working in the same conditions before but now it’s not working in the same situation i have one projectile that just fires from the location of the entity shooting it. That works fine and is really accurate, but when a projectile is far away from the “Caster” it stops working and is like way behind the intended target. By exactly 4 meters everytime it misses by one in-game cell everytime.

//This is my aiming script
public static Vector3 Aimbot(Transform target, Vector3 startPos, float projectileSpeed)
    {
        Vector3 enemyPostion = target.transform.position;
        Enemy enemy = target.GetComponent<Enemy>();
        Vector3 enemyPosition = target.GetComponent<Collider>().bounds.center;

        float distance = Vector3.Distance(startPos, enemyPosition);
        float travelTime = distance / (projectileSpeed + (enemy.velocity.magnitude));

        Vector3 predictedPosition = enemyPosition + (enemy.velocity * travelTime);

        return predictedPosition;
    }

//this is called when the projectile is created look at where I need to hit then move forward at a set speed.
void Start()
    {
        if(startVFX != null)
        Instantiate(startVFX, transform.position, startVFX.transform.rotation);
       
        if(GetComponent<Rigidbody>() == null)
        {
            Rigidbody rb = gameObject.AddComponent<Rigidbody>();
            rb.constraints = RigidbodyConstraints.FreezeAll;
            rb.useGravity = false;
        }
       
        transform.LookAt(DamageManager.Aimbot(target.transform, transform.position, speed));
    }

//calculate the targets velocity per frame
IEnumerator CalcVelocity()
    {
        while(true)
        {
            yield return new WaitForSeconds(Time.deltaTime);

            Vector3 currentPosition = transform.position;
            velocity = (currentPosition - lastPosition) / Time.deltaTime;

            lastPosition = currentPosition;
        }
    }