Sticky Projectile and Explosive Projectile problem c# - unity3d

Question

I cannot figure out what the problem is, suppose to be, when both explodeOnTouch and isSticky is true, it will call the parameter below, first stop the projectile movement with isKinematic then call the coroutine, but what happens is that only isKinematic is being called. Also extra questions, why is that the first projectile I instantiate is very fast, faster than the normal force I applied, and also why is that after the projectile lifeSpan is done and the projectile gameObject is destroyed, the force is still being applied making the for example enemy gameObject flying.
[Header("==BULLET SETTINGS==")]
[SerializeField] bool useGravity;
[SerializeField] float lifeSpan = 3.2f;
[SerializeField] List<string> tagName;
[Header("==BOUNCING==")]
[Range(0, 1)]
[SerializeField] float bounciness;
[SerializeField] bool isBouncing;
[Header("==EXPLOSIVE==")]
[SerializeField] bool explodeOnTouch = true;
[SerializeField] bool isSticky = true;
[SerializeField] float explosionRange;
[SerializeField] float explosionForce;
[SerializeField] float triggerForce;
[Header("==FREEZE==")]
[SerializeField] bool isFrozen;
[Header("==REFERENCE==")]
[SerializeField] LayerMask layer;
[SerializeField] Rigidbody rb;
PhysicMaterial physics_mat;
private void Start()
{
Setup();
}
private void Update()
{
BulletLifeSpan();
}
private void OnCollisionEnter(Collision collision)
{
Rigidbody enemyRb = collision.gameObject.GetComponent<Rigidbody>();
var collided = collision.gameObject.CompareTag(tagName[0]) || collision.gameObject.CompareTag(tagName[1]);
var explode = collision.relativeVelocity.magnitude >= triggerForce && explodeOnTouch;
if (explode && !isSticky)
{
Explode();
}
if (collided && isSticky && !explodeOnTouch)
{
rb.isKinematic = true;
}
if (explode && isSticky)
{
rb.isKinematic = true;
StartCoroutine(Delay());
}
if (collided && isFrozen)
{
enemyRb.isKinematic = true;
}
else if(collided && !isBouncing && !isSticky && !explodeOnTouch)
{
Destroy(gameObject);
}
Debug.Log("Player collided with: " + collision.gameObject.name + " with powerup set to none");
//Destroy(gameObject);
}
void Explode()
{
var surroundingObjects = Physics.OverlapSphere(transform.position, explosionRange);
foreach (var obj in surroundingObjects)
{
var rb = obj.GetComponent<Rigidbody>();
if (rb == null) continue;
rb.AddExplosionForce(explosionForce, transform.position, explosionRange);
}
Destroy(gameObject);
}
IEnumerator Delay()
{
yield return new WaitForSeconds(lifeSpan);
Explode();
}
void BulletLifeSpan()
{
//Bullet lifespan
lifeSpan -= Time.deltaTime;
if (lifeSpan <= 0)
{
Destroy(gameObject);
}
}
void Setup()
{
//Create a new Physic material
physics_mat = new PhysicMaterial();
physics_mat.bounciness = bounciness;
physics_mat.frictionCombine = PhysicMaterialCombine.Minimum;
physics_mat.bounceCombine = PhysicMaterialCombine.Maximum;
//Assign material to collider
GetComponent<SphereCollider>().material = physics_mat;
//Set gravity
rb.useGravity = useGravity;
}
private void OnDrawGizmosSelected()
{
Gizmos.color = Color.red;
Gizmos.DrawWireSphere(transform.position, explosionRange);
}