Why is the method being called every frame even though it is InvokeRepeating?

This is a snippet of logic from a basic enemy I created. It is supposed to get the distance from the player, and if the player is close enough, Instantiate a Trigger box to deal damage, and then destroy the box. It is supposed to instantiate the box every 3 seconds, with the help of the InvokeRepeating. However, after the first initial 3 seconds, instead of continuing to get called every 3 seconds, it gets called every frame, resulting in insta-death. Everything else works fine though.

 if (Vector2.Distance(player.transform.position, transform.position) <= 1.5f) {
             InvokeRepeating("Attack",3f, //Works Fine
             3f); //Gets ignored. Method gets called every frame.

         } else {
             CancelInvoke(); //Works Fine

         }

Attack method:

 void Attack () {
             GameObject clone;
             clone = Instantiate (attack, attackposition[i].position, Quaternion.identity) as GameObject;
             Destroy(clone, .01f);
 }