Duplication of icon in Toolbar

I have a problem with a project, it turns out that I have in the toolbar a search engine which looks inside a recyclerView, the search works wonders, the problem is that when I change from one fragment to another I double the icon of search, this happens every time I change from one fragment to another. The first fragment contains a ViewPager and the cart is a normal fragment, I attach images of the project, if you could help me I would be very grateful.

Here I make the fragment change

and when I go back to the fragment that contains the viewPager, I doubled the search icon

I enclose the code where I load the toolbar

package com.example.ingmanuel.mercaexpress.Fragments.Categories;

import android.app.Activity;
import android.content.Context;
import android.net.Uri;
import android.os.Bundle;
 import android.support.v4.app.Fragment;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.SearchView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.view.inputmethod.EditorInfo;
import android.widget.Toast;

import com.example.ingmanuel.mercaexpress.Adapters.ProductsAdapter;

import

com.example.ingmanuel.mercaexpress.Interface.IcomunicaFragmentProduct;

 import com.example.ingmanuel.mercaexpress.Models.ProductsModel;
 import com.example.ingmanuel.mercaexpress.R;
import java.util.ArrayList;


/**
* A simple {@link Fragment} subclass.
 * Activities that contain this fragment must implement the
 * {@link LacteosFragment.OnFragmentInteractionListener} interface
 * to handle interaction events.
 * Use the {@link LacteosFragment#newInstance} factory method to
 * create an instance of this fragment.
 */
public class LacteosFragment extends Fragment {

private RecyclerView recyclerProducts;
private ArrayList<ProductsModel> productList;
private ProductsAdapter adapter;

Activity activity;
IcomunicaFragmentProduct icomunicaFragmentProduct;




// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";

// TODO: Rename and change types of parameters
private String mParam1;
private String mParam2;

private OnFragmentInteractionListener mListener;

public LacteosFragment() {
    // Required empty public constructor
}

/**
 * Use this factory method to create a new instance of
 * this fragment using the provided parameters.
 *
 * @param param1 Parameter 1.
 * @param param2 Parameter 2.
 * @return A new instance of fragment LacteosFragment.
 */
// TODO: Rename and change types and number of parameters
public static LacteosFragment newInstance(String param1, String param2) {
    LacteosFragment fragment = new LacteosFragment();
    Bundle args = new Bundle();
    args.putString(ARG_PARAM1, param1);
    args.putString(ARG_PARAM2, param2);
    fragment.setArguments(args);
    return fragment;
}

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setHasOptionsMenu(true);
    if (getArguments() != null) {
        mParam1 = getArguments().getString(ARG_PARAM1);
        mParam2 = getArguments().getString(ARG_PARAM2);
    }
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View v = inflater.inflate(R.layout.fragment_lacteos, container, false);

    productList = new ArrayList<>();
    recyclerProducts = v.findViewById(R.id.recycler_milk);
    recyclerProducts.setLayoutManager(new GridLayoutManager(getContext(),2));

    llenarLista();

    adapter =  new ProductsAdapter(productList);
    recyclerProducts.setAdapter(adapter);

    /**Desde aqui capturamos el evento onclick**/
    onclick();

    return v;
}

private void onclick() {
    adapter.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            icomunicaFragmentProduct.sendProduct(productList.get(recyclerProducts.getChildAdapterPosition(v)));
        }
    });

}

private void llenarLista() {

    productList.add(new ProductsModel(1,1,R.drawable.ahorro, "Arroz Blanquita", "2000", "Arroz Blanquita 500gr", "No", "No"));
    productList.add(new ProductsModel(2,1,R.drawable.ahorro, "Arroz Roa", "1900", "Arroz Roa 500gr", "No", "No"));
    productList.add(new ProductsModel(3,1,R.drawable.ahorro, "Arroz Popular", "1500", "Arroz popular 500gr", "No", "No"));
    productList.add(new ProductsModel(1,1,R.drawable.ahorro, "Arroz Lider", "1600", "Arroz Blanco 400gr", "No", "No"));

}

// TODO: Rename method, update argument and hook method into UI event
public void onButtonPressed(Uri uri) {
    if (mListener != null) {
        mListener.onFragmentInteraction(uri);
    }
}

@Override
public void onAttach(Context context) {
    super.onAttach(context);

    if (context instanceof Activity){
        this.activity = (Activity) context;
        icomunicaFragmentProduct = (IcomunicaFragmentProduct) this.activity;
    }

    if (context instanceof OnFragmentInteractionListener) {
        mListener = (OnFragmentInteractionListener) context;
    } else {
        throw new RuntimeException(context.toString()
                + " must implement OnFragmentInteractionListener");
    }
}

@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
    inflater.inflate(R.menu.menu_toolbar, menu);

    MenuItem searchItem = menu.findItem(R.id.search);
    SearchView searchView = (SearchView) searchItem.getActionView();
    searchView.setImeOptions(EditorInfo.IME_ACTION_DONE);
    searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
        @Override
        public boolean onQueryTextSubmit(String s) {
            return false;
        }

        @Override
        public boolean onQueryTextChange(String s) {
            adapter.getFilter().filter(s);
            return false;
        }
    });
}

@Override
public void onDetach() {
    super.onDetach();
    mListener = null;
}

/**
 * This interface must be implemented by activities that contain this
 * fragment to allow an interaction in this fragment to be communicated
 * to the activity and potentially other fragments contained in that
 * activity.
 * <p>
 * See the Android Training lesson <a href=
 * "http://developer.android.com/training/basics/fragments/communicating.html"
 * >Communicating with Other Fragments</a> for more information.
 */
public interface OnFragmentInteractionListener {
    // TODO: Update argument type and name
    void onFragmentInteraction(Uri uri);
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()){
        case R.id.search:

        default:
            return super.onOptionsItemSelected(item);
    }
}

}