Problem with adding number of Potions

I have a script to when i pickup the gameobjet with this script, it add 1 potion to my player, but i don’t know why, it’s adding 2 potions no matter how i change the value, it add always 2.

using UnityEngine;
using System.Collections;

public class PotionPickup : MonoBehaviour {

	public int potionUp = 1;
	void Start(){
	void OnTriggerEnter (Collider other) {
		if (!other.CompareTag("Player")) return;
		FireButton.potion += potionUp;
		Destroy (gameObject);

I don’t know why but it is multiplying the value, if i set potionUp to 3, it give me 6,12,18.

It sounds like your OnTriggerEnter is getting called twice in one frame. Does your player have multiple colliders on it? I bet that (or something similar) is the problem. If so, you’ll need to add a flag to your component like “already used” and check that in OnTriggerEnter.