my bug

AbstractFragment.java

public class AbstractFragment extends Fragment {

    protected int fragmentId, toolbarTitle;

    private FragmentActivity activity;

    public AbstractFragment() {
    }


    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        if(savedInstanceState != null){
            fragmentId = savedInstanceState.getInt(FRAGMENT_ID);
            toolbarTitle = savedInstanceState.getInt(TITLE_RES);

        }else {

        }
        super.onCreate(savedInstanceState);
    }

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        activity = getActivity();
    }

    @Override
    public void onStart() {
        super.onStart();
        getMainActivity().setCheckedItem(fragmentId);
        getMainActivity().updateToolbarTitle(toolbarTitle);
    }

    @Override
    public void onDetach() {
        getMainActivity().deselectItem(fragmentId);
        super.onDetach();
    }

    @Override
    public void onSaveInstanceState(Bundle outState) {
        outState.putInt(FRAGMENT_ID, fragmentId);
        outState.putInt(TITLE_RES, toolbarTitle);
        super.onSaveInstanceState(outState);
    }

    protected CoreMainActivity getMainActivity(){
        return (CoreMainActivity) activity;
    }
}

Activity.java

@Override
protected void onResume() {
    super.onResume();
    Utils.p(TAG_M, "onResume" + this.hashCode());
    startLogin();
}

/**
 * Ивент о том, что в сервисе прошла авторизация и обновлены необходимые данные
 *
 * @param event {@link RestServiceEvent}
 */
@Subscribe(threadMode = ThreadMode.MAIN)
public void onEvent(RestServiceEvent event) {
    started = false;
    Utils.p(TAG_M, "RestServiceEvent() " + event.getAction());
    handleRestServiceEvent(event);
}

 protected void handleRestServiceEvent(RestServiceEvent event) {
     Utils.p(TAG, "handleRestServiceEvent event =" + event.getAction());
     if (event.getAction().equals(RestServiceEvent.Action.SERVICE_READY)) {
         replaceFragment(new OffersListMainFragment());
     }else{
        //неважно что
     }
}

protected void replaceFragment(Fragment fragment) {
    if (fragment == null) {
        fragment = new OffersListMainFragment();
        CURRENT_TAG = OffersListMainFragment.class.getSimpleName();
    } else {
        CURRENT_TAG = fragment.getClass().getSimpleName();
    }
    Utils.p(TAG, "replaceFragment CURRENT_TAG = " + CURRENT_TAG);
    hideKeyboard();
    
    if (isFragmentOnTop(CURRENT_TAG)) { // проверка есть ли этот фрагмент в стеке
        Utils.p(TAG, CURRENT_TAG + " is already on top ");
        closeDrawerMenu();
        return; // если есть выкидываем из метода
    }
    
    FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
    if (!launched) {
        launched = true;
        Utils.p(TAG, "First launch -> current fragment = " + CURRENT_TAG);
        fragmentTransaction.replace(R.id.content_main, fragment);
    } else {
        fragmentTransaction.replace(R.id.content_main, fragment, CURRENT_TAG);
        fragmentTransaction.addToBackStack(CURRENT_TAG);
    }
    fragmentTransaction.commit();
}
public boolean isFragmentOnTop(String tag) {
        int index = getSupportFragmentManager().getBackStackEntryCount() - 1;// last index
        if (index >= 0) {
            FragmentManager.BackStackEntry backEntry = getSupportFragmentManager().getBackStackEntryAt(index);
            return backEntry.getName().equals(tag);
        } else
            return false;
    }

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    tools:context="com.iogames.easymoneycore.ui_modules.activity.CoreMainActivity">

    <android.support.design.widget.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/AppTheme.AppBarOverlay"
        app:elevation="0dp">

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar_main"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            app:popupTheme="@style/AppTheme.PopupOverlay" />



    </android.support.design.widget.AppBarLayout>

    <include layout="@layout/content_main" />


</android.support.design.widget.CoordinatorLayout>

content_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:context="com.iogames.easymoneycore.ui_modules.activity.CoreMainActivity"
    tools:showIn="@layout/activity_core_main">

    <FrameLayout
        android:id="@+id/content_main"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

    </FrameLayout>
</LinearLayout>

fragment_offers_list_main.xml

<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android">

    <RelativeLayout xmlns:app="http://schemas.android.com/apk/res-auto"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <android.support.design.widget.TabLayout
            android:id="@+id/offer_tabs_layout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="?attr/colorPrimary"
            android:elevation="2dp"
            app:tabIndicatorColor="@color/colorAccent"
            app:tabIndicatorHeight="3dp"
            app:tabMode="fixed"
            app:tabSelectedTextColor="@android:color/white"
            app:tabTextColor="@color/whiteColorUnselected" />

        <android.support.v4.view.ViewPager
            android:id="@+id/view_pager_offers"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_below="@+id/offer_tabs_layout" />

    </RelativeLayout>
</layout>

OffersListMainFragment.java

public class OffersListMainFragment extends AbstractFragment {

    private FragmentOffersListMainBinding binding;

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        fragmentId = Const.DrawerID.TASKS;
        toolbarTitle = R.string.title_easy_money;
        super.onCreate(savedInstanceState);
    }

    private int countLaunches;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        binding = DataBindingUtil.inflate(inflater, R.layout.fragment_offers_list_main, container, false);
        // Initialize the ViewPager and set an adapter
        ArrayList<Fragment> tabFragmentList = new ArrayList<>();
        tabFragmentList.add(new AllOffersListFragment());
        tabFragmentList.add(new UsersOfferListFragment());
        tabFragmentList.add(new OldOfferListFragment());

        String[] TITLES = {
                Utils.getString(R.string.our_tasks),
                Utils.getString(R.string.title_pinned),
                Utils.getString(R.string.completed)
        };
        binding.viewPagerOffers.setAdapter(new TabsFragmentAdapter(getChildFragmentManager(), tabFragmentList, TITLES));
        binding.offerTabsLayout.setupWithViewPager(binding.viewPagerOffers);
        countLaunches = 0;
        return binding.getRoot();
    }

    @Override
    public void onStart() {
        getActivity().invalidateOptionsMenu();       
        super.onStart();
    }

}

TabsFragmentAdapter.java

public class TabsFragmentAdapter extends FragmentPagerAdapter {

    private ArrayList<Fragment> tabsList;
    private String[] titlesArray;

    public TabsFragmentAdapter(FragmentManager frManager, ArrayList<Fragment> fragmentList, String[] titles) {
        super(frManager);
        this.tabsList = fragmentList;
        this.titlesArray = titles;
    }

    @Override
    public CharSequence getPageTitle(int position) {
        return this.titlesArray[position];
    }

    @Override
    public Fragment getItem(int position) {
        return tabsList.get(position);
    }

    @Override
    public int getCount() {
        return tabsList.size();
    }
}