Problem when populating Recyclerview from Firebase Database on Android

Good afternoon, I have a problem when populating recyclerview with data from Firebase database.

These are the data that I have stored in the Firebase database:

They all have the same characteristics (description, image, price, type).

My problem is when I want to populate ALL EXISTING DATA ( from Tombstones to Mugs ) in the RecyclerView, it does not show me anything, I do not have an error in the custom RecyclerView or nothing, because when populating with the data of, for example, "tiles", this works perfectly for me, I leave here the code where the recyclerview is filled. I'm probably doing something wrong here.

public class ProductosActivity extends AppCompatActivity {

ProgressDialog progressDialog;
private RecyclerView recyclerProductos;   
FirebaseDatabase firebaseDatabase;
DatabaseReference data;



@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_productos);

    recyclerProductos = (RecyclerView) findViewById(R.id.recyclerProductos);

    progressDialog = new ProgressDialog(this);

    LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
    recyclerProductos.setLayoutManager(linearLayoutManager);


    progressDialog.setMessage("Cargando imagenes..");
    progressDialog.show();

    firebaseDatabase = FirebaseDatabase.getInstance();
    data = firebaseDatabase.getReference("productos");
    data.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            ArrayList<ProductoBean> pb = new ArrayList<ProductoBean>();
                             pb.clear();

            for (DataSnapshot dt : dataSnapshot.getChildren()) {
                ProductoBean prod = dt.getValue(ProductoBean.class);
                Log.i("Datos", dt.getValue().toString());
                pb.add(prod);
            }

            ProductoAdaptador adaptador = new ProductoAdaptador(ProductosActivity.this, pb);
            progressDialog.dismiss();
            recyclerProductos.setAdapter(adaptador);

            adaptador.notifyDataSetChanged();

        }

        @Override
        public void onCancelled(DatabaseError databaseError) {
            Log.e("Error", databaseError.getMessage());
           }
       });
     }
  }

When I want to only populate data from for example "tiles", I do this and it works correctly.

                         .
                         .
                         .

  data.child("lozas")addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            ArrayList<ProductoBean> pb = new ArrayList<ProductoBean>();
                             pb.clear();

            for (DataSnapshot dt : dataSnapshot.getChildren()) {
                ProductoBean prod = dt.getValue(ProductoBean.class);
                Log.i("Datos", dt.getValue().toString());
                pb.add(prod);
            }

            ProductoAdaptador adaptador = new ProductoAdaptador(ProductosActivity.this, pb);
            progressDialog.dismiss();
            recyclerProductos.setAdapter(adaptador);

            adaptador.notifyDataSetChanged();

        }

        @Override
        public void onCancelled(DatabaseError databaseError) {
            Log.e("Error", databaseError.getMessage());
           }
       });
     }
  }

UPDATE This code is from the recyclerview adapter.

public class ProductoAdaptador extends RecyclerView.Adapter<ProductoAdaptador.ProductoViewHolder> {

ArrayList<ProductoBean> productoBean;
Context context;


public ProductoAdaptador(Context ctx, ArrayList<ProductoBean> pb){
    this.context = ctx;
    this.productoBean = pb;
}


@Override
public ProductoViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

    View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.row_recyclerview_productos,parent,false);
    ProductoViewHolder holder = new ProductoViewHolder(view);

    return holder;
}

@Override
public void onBindViewHolder(ProductoViewHolder holder, int position) {
    ProductoBean prod = productoBean.get(position);

    Picasso.with(context).load(prod.getImagen()).into(holder.imagen);
    //holder.imagen.setImageUrl(prod.getImagen());
    holder.tipo.setText(prod.getTipo());
    holder.descripcion.setText(prod.getDescripcion());
    holder.precio.setText(prod.getPrecio());

}

@Override
public int getItemCount() {
    return productoBean.size();
}

public static class ProductoViewHolder extends RecyclerView.ViewHolder {

    SmartImageView imagen;
    AutofitTextView tipo, descripcion, precio;


    public ProductoViewHolder(View itemView) {
        super(itemView);

        imagen = (SmartImageView) itemView.findViewById(R.id.SmartImageProducto);
        tipo = (AutofitTextView) itemView.findViewById(R.id.txtTipoProducto);
        descripcion = (AutofitTextView) itemView.findViewById(R.id.txtDescripcionProducto);
        precio = (AutofitTextView) itemView.findViewById(R.id.txtPrecioProducto);

         }
     }
 }

UPDATE 2

Bean Product Class (get / set / constructor)

public class ProductoBean {


private String descripcion;
private String imagen;
private String precio;
private String tipo;


public ProductoBean(){

}

public ProductoBean(String descripcion, String imagen, String precio, String tipo){
    this.descripcion = descripcion;
    this.imagen = imagen;
    this.precio = precio;
    this.tipo = tipo;
}


public String getDescripcion() {
    return descripcion;
}

public void setDescripcion(String descripcion) {
    this.descripcion = descripcion;
}

public String getImagen() {
    return imagen;
}

public void setImagen(String imagen) {
    this.imagen = imagen;
}

public String getPrecio() {
    return precio;
}

public void setPrecio(String precio) {
    this.precio = precio;
}

public String getTipo() {
    return tipo;
}

public void setTipo(String tipo) {
    this.tipo = tipo;
}

}

Then finally my question is how to populate the recycler with all the data (from tombstones to cups).