Custom repetable fields appear six times each and won’t save

(This is a repost from https://stackoverflow.com/questions/53086726/cmb2-custom-repetable-fields-appear-six-times-each-and-wont-save – I got no help nor even views from there, though seems chances of getting help here are not much better).

I’m trying to deploy a couple of custom repeatable fields, phone and mobile. Each field has several inputs (Country code, area code (for phone), number, and extension(s) (for phone)). These fields will go along with some others as part of a ‘contacts’ set, which are into group fields. So, repeatable custom field into a group field.

On a existing class I was using to return values from certain CPTs, and based on the example of an US address field type provided by CMB2 devs (which to be honest I couldn’t get to work – it failed saying it couldn’t find the CMB2_Type_Base class) I included the following to render, sanitize and escape such fields:

class cmb2Opciones
{
    public function __construct()
    {
        add_action( 'cmb2_sanitize_fijos', array( $this, 'cmb2_sanitize_telefonos_callback' ), 10, 5 );
        add_action( 'cmb2_sanitize_celulares', array( $this, 'cmb2_sanitize_telefonos_callback' ), 10, 5 );
        add_action( 'cmb2_types_esc_fijos', array( $this, 'cmb2_escape_telefonos_callback' ), 10, 4 );
        add_action( 'cmb2_types_esc_celulares', array( $this, 'cmb2_escape_telefonos_callback' ), 10, 4 );
        add_action( 'cmb2_render_fijos', array( $this, 'cmb2_render_fijos_callback' ), 10, 5 );
        add_action( 'cmb2_render_celulares', array( $this, 'cmb2_render_celulares_callback' ), 10, 5 );
    }

    public function cmb2_escape_telefonos_callback( $check, $meta_value, $field_args, $field_object )
    {
        if ( ! is_array( $meta_value ) || ! $field_args['repeatable'] )
        {
            return $check;
        }

        foreach ( $meta_value as $key => $val )
        {
            if ( empty ( implode ( '', $val )))
            {
                unset ( $meta_value[$key] );
            }

            else
            {
                $meta_value[ $key ] = esc_attr ( $val );
            }
        }

        return array_filter( $meta_value );
    }

    public function cmb2_sanitize_telefonos_callback( $check, $meta_value, $object_id, $field_args, $sanitize_object )
    {
        if ( ! is_array( $meta_value ) || ! $field_args['repeatable'] )
        {
            return $check;
        }

        foreach ( $meta_value as $key => $val )
        {
            $meta_value[ $key ] = array_filter( array_map( 'sanitize_text_field', $val ) );
            }

        return array_filter( $meta_value );
    }

    public function cmb2_render_fijos_callback( $field, $escaped_value, $object_id, $object_type, $field_type )
    {
        $escaped_value = wp_parse_args( $escaped_value, array(
            'fijo_pais' => '',
            'fijo_area' => '',
            'fijo_numero' => '',
            'fijo_extension' => '',
        ));

        $output  = '<div style="overflow:hidden">';
        $output .= '<div class="alignleft" style="width:4em">';
        $output .= $field_type->input( array(
            'name'  => $field_type->_name( '[fijo_pais]' ),
            'id'  => $field_type->_id( '_fijo_pais' ),
            'value'  => $escaped_value['fijo_pais'],
            'type' => 'number',
        ));
        $output .= '</div>';
        $output .= '<div class="alignleft" style="width:3em">';
        $output .= $field_type->input( array(
            'name'  => $field_type->_name( '[fijo_area]' ),
            'id'  => $field_type->_id( '_fijo_area' ),
            'value'  => $escaped_value['fijo_area'],
            'type' => 'number',
        ));
        $output .= '</div>';
        $output .= '<div class="alignleft" style="width:calc(100% - 25em)">';
        $output .= $field_type->input( array(
            'name'  => $field_type->_name( '[fijo_numero]' ),
            'id'  => $field_type->_id( '_fijo_numero' ),
            'value'  => $escaped_value['fijo_numero'],
            'type' => 'number',
        ));
        $output .= '</div>';
        $output .= '<div class="alignleft" style="width:15em">';
        $output .= $field_type->input( array(
            'name'  => $field_type->_name( '[fijo_extension]' ),
            'id'  => $field_type->_id( '_fijo_extension' ),
            'value'  => $escaped_value['fijo_extension'],
            'type' => 'text',
        ));
        $output .= '</div></div>';

        echo $output;
        echo $field_type->_desc( true );
    }

    public function cmb2_render_celulares_callback( $field, $escaped_value, $object_id, $object_type, $field_type )
    {
        $escaped_value = wp_parse_args( $escaped_value, array(
            'celular_pais' => '',
            'celular_numero' => '',
        ));

        $output  = '<div style="overflow:hidden">';
        $output .= '<div class="alignleft" style="width:4em">';
        $output .= $field_type->input( array(
            'name'  => $field_type->_name( '[celular_pais]' ),
            'id'  => $field_type->_id( '_celular_pais' ),
            'value'  => $escaped_value['celular_pais'],
            'type' => 'number',
        ));
        $output .= '</div>';
        $output .= '<div class="alignleft" style="width:calc(100% - 5em)">';
        $output .= $field_type->input( array(
            'name'  => $field_type->_name( '[celular_numero]' ),
            'id'  => $field_type->_id( '_celular_numero' ),
            'value'  => $escaped_value['celular_numero'],
            'type' => 'number',
        ));
        $output .= '</div></div>';

        echo $output;
        echo $field_type->_desc( true );
    }

// Other non-related CMB2 functions...
}

And for the initialization I did the following:

global $cmb2; // This is calling an instance of "cmb2Opciones", created at init

$box->add_group_field( $group, array(
    'name' => __('Teléfono fijo', 'uniagraria'),
    'id' => $prefix . 'contactos_fijos',
    'type' => 'fijos',
    'repeatable' => true,
    'sanitization_cb' => array( $cmb2, 'cmb2_sanitize_telefonos' ),
    'escape_cb' => array( $cmb2, 'cmb2_escape_telefonos' ),
    'text' => array(
        'add_row_text' => __('Agregar otro teléfono fijo', 'uniagraria'),
    ),
));

$box->add_group_field( $group, array(
    'name' => __('Celular', 'uniagraria'),
    'id' => $prefix . 'contactos_celulares',
    'type' => 'celulares',
    'repeatable' => true,
    'sanitization_cb' => array( $cmb2, 'cmb2_sanitize_telefonos' ),
    'escape_cb' => array( $cmb2, 'cmb2_escape_telefonos' ),
    'text' => array(
        'add_row_text' => __('Agregar otro celular', 'uniagraria'),
    ),
));

The problem is that for each repeatable field it shows 6 times the custom field, and if I fill up a row it just won’t save just because the web is magic and wonderful:

I’m not sure if there’s something I’m doing wrong or if this is some kind of bug, ’cause I recall there were some fixes in CMB2 to make it more field-repeating friendly. However, I will glad if someone can point me out on what is going on.

The page I need help with: [log in to see the link]