position of checkbox get change after filter in listview

private class CustomAdapterProductos extends ArrayAdapter> {

    boolean[] checkBoxState;
    ArrayList<HashMap<String, String>> data_original;
    ArrayList<HashMap<String, String>> data_filter;

; ViewHolder viewHolder ;

    ProductosFilter filter_;

    public CustomAdapterProductos(Context context, int textViewResourceId, ArrayList<HashMap<String, String>> productos_) {

        super(context, textViewResourceId, productos_);

        this.data_original=new ArrayList<HashMap<String, String>>();
        this.data_original.addAll(productos_);
        this.data_filter = new ArrayList<HashMap<String, String>>();
        this.data_filter.addAll(productos_);
      this.checkBoxState = new boolean[productos_.size()];

    }



    @Override
    public Filter getFilter() {
        if (filter_ == null){
            filter_  = new ProductosFilter();
        }
        return filter_;
    }


    private class ViewHolder {

        TextView nombre, descripcion, tipo;
        CheckBox checkBox;


    }



    @Override
    public View getView(final int position, View convertView, final ViewGroup parent) {

        if (convertView == null) {
            convertView = inflater.inflate(R.layout.list_item, null);
            viewHolder = new ViewHolder();

            viewHolder.nombre = (TextView) convertView.findViewById(R.id.pname);
            viewHolder.tipo = (TextView) convertView.findViewById(R.id.pnomtipo);
            viewHolder.descripcion = (TextView) convertView.findViewById(R.id.pdescrip);
            viewHolder.checkBox = (CheckBox) convertView.findViewById(R.id.checkBox_p);

            convertView.setTag(viewHolder);


        } else
            viewHolder = (ViewHolder) convertView.getTag();

        viewHolder.nombre.setText(data_filter.get(position).get(TAG_NAME).toString());
        viewHolder.descripcion.setText(data_filter.get(position).get(TAG_DESC).toString());
        viewHolder.tipo.setText(data_filter.get(position).get("nombre_tipo").toString());


        viewHolder.checkBox.setChecked(checkBoxState[position]);



        viewHolder.checkBox.setOnClickListener(new View.OnClickListener() {

            public void onClick(View v) {
                if (((CheckBox) v).isChecked())
                    checkBoxState[position] = true;

                else
                    checkBoxState[position] = false;

            }
        });


        return convertView;
    }

    private class ProductosFilter extends Filter  {

        @Override
        protected FilterResults performFiltering(CharSequence constraint) {
            FilterResults result = new FilterResults();
            if(constraint != null && constraint.toString().length() > 0) {
                ArrayList<HashMap<String, String>> filteredItems = new ArrayList<HashMap<String, String>>();

                for(int i = 0, l =data_original.size() ;i < l; i++)
                {

                    String va=data_original.get(i).get(TAG_NAME);

                    if(va.toLowerCase().contains(constraint)){
                        filteredItems.add(data_original.get(i));
                    }

                }
                result.count = filteredItems.size();
                result.values = filteredItems;
            }else{
                synchronized(this)
                {
                    result.values = data_original;
                    result.count = data_original.size();
                }
            }
            return result;
        }

        @SuppressWarnings("unchecked")
        @Override
        protected void publishResults(CharSequence constraint, FilterResults results) {





            data_filter= (ArrayList<HashMap<String,String>>)results.values;
            notifyDataSetChanged();
            clear();
            for(int i=0, l=data_filter.size();i<l;i++){
                add(data_filter.get(i));

            notifyDataSetInvalidated();}


        }

        }




    }

If I do a search in the filter and found 3 results and select the position 2, when I remove the filter listview original position 2 is selected ..