Each update runs my code 6 times per line. Is it a bug?

Ok, here is the deal... am trying to make an update so for each second I will add 1 point. My result is that each second I get 6 points... And why this happens is not because the update runs 6 times like a loop, it is because each line when in the update is running 6 times before going to the next line of code, and it is 6 times and so on.

private float timeLeft = 1.0f; void Update(){

  timeLeft -= Time.deltaTime;
 if(timeLeft == 0) //so each second I get inside my if statement...
 {
     //add score runs 6 times 
 ScoreCounter.add(1); //debug breakpoints hits here 6 times before going to next         line bellow that resets the timer.
     //reset timer runs 6 times
 timeLeft = 1.0f; 
 }

}

My issue seems to be totally illogical to me, and can not find anyone having the same problem... Do someone got answers to this behavior?