Function onTap, KetaiGesture in Processing for Android

Processing for Android
1

Hello everyone, I have a concern, I am trying to do the following: create objects with a tap on the device, but when counting the objects, the onTap function seems to create twice as many objects.

The principal:

import android.view.MotionEvent;
import ketai.ui.*;

KetaiGesture gesture;
ArrayList<Modulo> mds = new ArrayList<Modulo>();
int diam;

void setup() {
  fullScreen();
  orientation(PORTRAIT);
  
  gesture = new KetaiGesture(this);
  textSize(80);
  diam = 100;
  Modulo m1 = new Modulo(1,10,100);
  Modulo m2 = new Modulo(2,50,100);
  Modulo m3 = new Modulo(3,100,100);
  mds.add(m1);
  mds.add(m2);
  mds.add(m3);
       text(mds.size(),350,200);
}
 
void draw() {
  background(0,255,0);
  
  if (mds.size()>0){
    for (int i= mds.size()-1; i>=0; i--) {
      Modulo s = mds.get(i);
      if (s.isActiva()==false) {
        mds.remove(s);
        
      } else {
        s.display();
        text(mds.size(),100,250);
      }
    }
  }
}

void onTap(float x, float y) {
  //agrega dos objetos?? :c  
   mds.add(new Modulo(mds.size(), x, y));
}

void mousePressed() {
  
}
void mouseDragged() {
}

public boolean surfaceTouchEvent (MotionEvent event) {
  super.surfaceTouchEvent(event);
  return  gesture.surfaceTouchEvent(event);
}

The modulo:

class Modulo{
  PVector pos;
  int id;
  boolean activa;
  
  
  Modulo(int id_,float x, float y){
    id=id_;
    pos = new PVector (x,y);
    activa = true;
    
  }
  
  void setActiva(boolean activa_){
     activa = activa_;
  }
  
  void update(){
    pos.x = mouseX;
    pos.y = mouseY;
  }
  
  void display(){
    pushStyle();
    stroke(245,0,0);
    fill(255,0,0);
    ellipse(pos.x,pos.y,diam,diam);
    popStyle();
    text(id,pos.x,pos.y);
  }
  
  boolean isActiva(){
    return activa;
  }
  
  boolean over () {
    if (dist(mouseX, mouseY, pos.x, pos.y) < diam/2) {
      return true;
    } else {
      return false;
    }
  }
  void mouseDragged(){
    if (dist(mouseX, mouseY, pos.x, pos.y) > diam/2)
      return; // 
      update();
  }
  
  void mousePressed(){
    if (dist(mouseX, mouseY, pos.x, pos.y) > diam/2)
      return;
      update();
  }
}

Is there a way to create a single object with the onTap function?