[SOLVED]Physics.OverlapSphere not working

I have the following code:

Code (CSharp):

1. private IEnumerator SpellDOT()
2.     {
3.         Collider[] colliders = Physics.OverlapSphere(thisSpellTarget.transform.position, spellDamageRadius);
4.  
5.         foreach (Collider collider in colliders)
6.         {
7.             if (collider.tag == "Enemy")
8.             {
9.                 //Debug.Log(targetEnemy);
10.                 //Debug.Log(spellDamageOverTime * Time.deltaTime);
11.                 targetEnemy.TakeDamage(spellDamageOverTime);
12.             }
13.         }
14.  
15.         yield return new WaitForSeconds(3f);
16.     }

It seems only one enemy get damaged at the edge of the sphere. Also the

Code (CSharp):

1. spellDamageOverTime * Time.deltaTime

return a small value like 6.1 when

Code (CSharp):

1. spellOverTime = 500

 

I had to add

Code (CSharp):

1. targetEnemy = collider.GetComponent<Enemy>();

inside the if statement.