Group repeater in settings page

I am struggling and probably out of my depth so could do with a pointer.
I am using AIO plugin.
I have a settings page with 3 tabs. On one of them I have created a cloneable group field where the day of the week along with two times can be selected multiple times (ie entering variable Opening Hours).The produced php code looks like:

<?php
add_filter( 'rwmb_meta_boxes', 'your_prefix_function_name' );

function your_prefix_function_name( $meta_boxes ) {
    $prefix = '';

    $meta_boxes[] = [
        'title'          => __( 'Business settings hours', 'your-text-domain' ),
        'id'             => 'business-settings-hours',
        'settings_pages' => ['business-data'],
        'tab'            => 'Hours',
        'fields'         => [
            [
                'name'              => __( 'Open Hours', 'your-text-domain' ),
                'id'                => $prefix . 'open_hours',
                'type'              => 'group',
                'clone'             => true,
                'clone_as_multiple' => true,
                'max_clone'         => 7,
                'fields'            => [
                    [
                        'name'    => __( 'Day', 'your-text-domain' ),
                        'id'      => $prefix . 'day',
                        'type'    => 'select',
                        'options' => [
                            'Monday'    => __( 'Monday', 'your-text-domain' ),
                            'Tuesday'   => __( 'Tuesday', 'your-text-domain' ),
                            'Wednesday' => __( 'Wednesday', 'your-text-domain' ),
                            'Thursday'  => __( 'Thursday', 'your-text-domain' ),
                            'Friday'    => __( 'Friday', 'your-text-domain' ),
                            'Saturday'  => __( 'Saturday', 'your-text-domain' ),
                            'Sunday'    => __( 'Sunday', 'your-text-domain' ),
                        ],
                    ],
                    [
                        'name' => __( 'Open', 'your-text-domain' ),
                        'id'   => $prefix . 'open',
                        'type' => 'time',
                    ],
                    [
                        'name' => __( 'Close', 'your-text-domain' ),
                        'id'   => $prefix . 'close',
                        'type' => 'time',
                    ],
                ],
            ],
        ],
    ];

    return $meta_boxes;
}

From the settings page, the add more works to create extra, but upon save settings the page resets and the values do not appear to be saved (they do not seem to be able to override settings in relevant entry of wp_options table.
I then need to print these out in a looped query.
Can you please point me in the right direction?