Events are two working problems

Ionic Framework ionic-v3
1

Hello there. I am developing a virtual market application.
I am running an event in the tab menu when I delete the cart. But this event is working twice. The first time I open the program, it only works once, but when I repeat the same operation a second time, the event works twice.
How can I solve this problem?
I Share Codes.
Cart Codes :


sepetiSil(){
  let loader = this.loader.create({
    content : "Lütfen bekleyiniz.."
  });
  let header = new Headers();
  header.append("Content-Type","application/json");
  header.append("Accept","application/json");
  var base_url = "xxxxxxxxx/xxx";
  var veri = JSON.stringify({
    BELGEID : this.globalBelgeID
  });
  loader.present();
  this.http.post(base_url, veri, header).map(res=>res.text()).subscribe(data=>{
      this.sepetArray.pop();
      this.MIKTARMODEL.pop();
      this.URUNTUTARMODEL.pop();
      this.TOPLAMTUTAR = 0;
    
 this.events.publish('sepet:sayacsifirla');
      var mesaj = "Sepet başarıyla temizlendi.";
      loader.dismissAll();
      this.mesajOlustur(mesaj);
  },(error)=>{ loader.dismissAll(); this.sepetiSil(); });
}

Tabs Codes:

this.events.subscribe('sepet:sayacsifirla',()=>{
        this.SEPETSAYISI = 0;
        this.dizi.pop();
        this.SEPETURUNLER.pop();
        console.log(this.dizi);
        console.log("SAYAÇ SIFIRLANDI VE YÖNLENDİRİLME YAPILDI");
        this.app.getRootNav().setRoot(TabsPage);
      });

As you can see, the event works twice
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