Metaboxes not saving upon deactivating MetaBox Builder

hi. as long as I have MetaBox and MetaBox AIO installed, the meta boxes show up fine.
When I deactivate just MetaBox AIO, the meta boxes go away and the groups collapse to just one line...

can you please help?

here is my code:

function nbm_events_create_main_mb( $meta_boxes ) {
    $prefix = 'event-';

    $meta_boxes[] = array (
        'title' => esc_html__( 'Events Metabox', 'nbm-events' ),
        'id' => 'nbm_events_main',
        'post_types' => array(
            0 => 'events',
        ),
        'context' => 'normal',
        'priority' => 'high',
        'fields' => array(
            array (
                'id' => $prefix . 'whenwhere',
                'type' => 'group',
                'name' => esc_html__( 'WHEN & WHERE', 'nbm-events' ),
                'fields' => array(
                    array (
                        'id' => $prefix . 'start',
                        'type' => 'datetime',
                        'name' => esc_html__( 'Event Starts', 'nbm-events' ),
                    ),
                    array (
                        'id' => $prefix . 'end',
                        'type' => 'datetime',
                        'name' => esc_html__( 'Event Ends', 'nbm-events' ),
                    ),
                    array (
                        'id' => $prefix . 'loc-opt',
                        'name' => esc_html__( 'Radio', 'nbm-events' ),
                        'type' => 'radio',
                        'options' => array(
                            'online' => esc_html__( 'Online', 'nbm-events' ),
                            'efcc' => esc_html__( 'EFCC', 'nbm-events' ),
                            'off' => esc_html__( 'Off-Campus', 'nbm-events' ),
                        ),
                        'required' => 1,
                    ),
                    array (
                        'id' => $prefix . 'loc-name',
                        'type' => 'text',
                        'name' => esc_html__( 'Location Name', 'nbm-events' ),
                        'visible' => array(
                            'when' => array(
                                array (
                                    0 => 'loc-opt',
                                    1 => '=',
                                    2 => 'off',
                                ),
                            ),
                            'relation' => 'and',
                        ),
                    ),
                    array (
                        'id' => $prefix . 'loc-address',
                        'type' => 'text',
                        'name' => esc_html__( 'Address', 'nbm-events' ),
                        'visible' => array(
                            'when' => array(
                                array (
                                    0 => 'loc-opt',
                                    1 => '=',
                                    2 => 'off',
                                ),
                            ),
                            'relation' => 'and',
                        ),
                    ),
                    array (
                        'id' => $prefix . 'loc-bld',
                        'type' => 'text',
                        'name' => esc_html__( 'Building / Room #', 'nbm-events' ),
                        'visible' => array(
                            'when' => array(
                                array (
                                    0 => 'loc-opt',
                                    1 => '=',
                                    2 => 'efcc',
                                ),
                            ),
                            'relation' => 'and',
                        ),
                    ),
                ),
                'default_state' => 'expanded',
                'columns' => 4,
            ),
            array (
                'id' => $prefix . 'registration',
                'type' => 'group',
                'name' => esc_html__( 'REGISTRATION', 'nbm-events' ),
                'fields' => array(
                    array (
                        'id' => $prefix . 'reg-req',
                        'name' => esc_html__( 'Registration Required?', 'nbm-events' ),
                        'type' => 'checkbox',
                    ),
                    array (
                        'id' => $prefix . 'reg-link',
                        'type' => 'url',
                        'name' => esc_html__( 'Registration Link', 'nbm-events' ),
                        'visible' => array(
                            'when' => array(
                                array (
                                    0 => 'reg-req',
                                    1 => '=',
                                    2 => 1,
                                ),
                            ),
                            'relation' => 'and',
                        ),
                    ),
                    array (
                        'id' => $prefix . 'cost-req',
                        'name' => esc_html__( 'Is there a Cost?', 'nbm-events' ),
                        'type' => 'checkbox',
                    ),
                    array (
                        'id' => $prefix . 'cost',
                        'type' => 'text',
                        'name' => esc_html__( 'Cost', 'nbm-events' ),
                        'visible' => array(
                            'when' => array(
                                array (
                                    0 => 'cost-req',
                                    1 => '=',
                                    2 => 1,
                                ),
                            ),
                            'relation' => 'and',
                        ),
                    ),
                ),
                'default_state' => 'expanded',
                'columns' => 4,
            ),
            array (
                'id' => $prefix . 'poc',
                'type' => 'group',
                'name' => esc_html__( 'POINT OF CONTACT', 'nbm-events' ),
                'fields' => array(
                    array (
                        'id' => $prefix . 'poc-name',
                        'type' => 'text',
                        'name' => esc_html__( 'Contact Name', 'nbm-events' ),
                    ),
                    array (
                        'id' => $prefix . 'poc-email',
                        'name' => esc_html__( 'Contact Email', 'nbm-events' ),
                        'type' => 'email',
                    ),
                    array (
                        'id' => $prefix . 'poc-tel',
                        'type' => 'text',
                        'name' => esc_html__( 'Contact Number', 'nbm-events' ),
                    ),
                ),
                'default_state' => 'expanded',
                'columns' => 4,
            ),
        ),
        'text_domain' => 'nbm-events',
    );

    return $meta_boxes;
}