Array creating a non-existing record - Ionic / Firebase

Ionic Framework ionic-v3
1

Hi,

I am learning Ionic/Angular with Firebase and can’t progress further now therefore I’ve came here to ask for help.

Basically I am requesting an array from firebase that contains 2 items and creating an component with that information to present but it keeps duplicating the first item, code below:

perfil.ts


loadExp(){

    this.perfilExpKeys = [];
    this.db.getExpUser(this.auth.getLoggedUID()).then ((data) => {   
    this.perfilExp = data.val();                                     
      console.log(this.perfilExp);

    this.itemsService.getKeys(this.perfilExp).forEach((key) => {
      console.log(key);
      console.log(this.perfilExpKeys);
      this.perfilExpKeys.push(key);
      this.pegaExp();
});
});
});
}

  pegaExp(){
    this.perfilExpKeys.forEach(key => {
        this.db.getExpRef().child(key).once('value').then((snap) => {
          console.log(snap.val());
        this.experiencias.unshift(this.mappingService.getExp(snap.val(), key));
      });
    });
  }

database methods

getExpUser(userUid: string) {
        return this.experienciasRef.orderByChild('user/uid').equalTo(userUid).once('value');
        }

    getExpRef(){
 return this.experienciasRef;
}
items service method

    getKeys(object): string[] {
    return lodash.keysIn(object);
}

mapping method

getExp(snapshot: any, key: string): Expinterface {

    let experiencia: Expinterface = {
      key: key,
      titulo: snapshot.titulo,
      detalhes: snapshot.detalhes,
      localizacao: {
          street:         snapshot.localizacao.street,
          houseNumber:    snapshot.localizacao.houseNumber,
          postalCode:     snapshot.localizacao.postalCode,
          city:           snapshot.localizacao.city,
          district:       snapshot.localizacao.district,
          countryName:    snapshot.localizacao.countryName,
          countryCode:    snapshot.localizacao.countryCode,
          latEncontrada:  snapshot.localizacao.latEncontrada,
          lngEncontrada:  snapshot.localizacao.lngEncontrada
        },
      linguas: snapshot.linguas,
      preco: snapshot.preco,
      dateCreated: snapshot.dateCreated,
      user: {
        uid:      snapshot.user.uid,
        username: snapshot.user.username
      },
      comments: snapshot.comments == null ? 0 : snapshot.comments,
      duracao: snapshot.duracao,
      categoria: snapshot.categoria
    };

    return experiencia;
}

logs that it is sending twice the first object of array:

Object {-Kn5OGt8m_2zSSUVRb5b: Object, -Kn5OPCd1R52AA2Y2Dve: Object}
perfil.ts:139 -Kn5OGt8m_2zSSUVRb5b
perfil.ts:140 []
perfil.ts:139 -Kn5OPCd1R52AA2Y2Dve
perfil.ts:140 ["-Kn5OGt8m_2zSSUVRb5b"]
perfil.ts:151 Object {categoria: "beer", dateCreated: "Tue Jun 20 2017 13:45:34 GMT-0300 (-03)", detalhes: "te", duracao: "2", linguas: Array(1)…}
perfil.ts:151 Object {categoria: "beer", dateCreated: "Tue Jun 20 2017 13:45:34 GMT-0300 (-03)", detalhes: "te", duracao: "2", linguas: Array(1)…}
perfil.ts:151 Object {categoria: "beer", dateCreated: "Tue Jun 20 2017 13:46:08 GMT-0300 (-03)", detalhes: "te", duracao: "2", linguas: Array(1)…}

any help would be much appreciated.

firebase scheme:

thanks.