Custom table - all my range inputs are saving to 1 not to value specified

All my range inputs are saving to 1 not to value specified

These are the field names in helper function

public function table_fields() {
    $result = array(
        'Cntry. NL Rank'   => 'TINYINT(1) NOT NULL',
        'Cntry. NZ Rank'   => 'TINYINT(1) NOT NULL',
        'Cntry. SA Rank'   => 'TINYINT(1) NOT NULL',

);
return $result;

}

this is the table situation

public function prefix_create_table() {
    if ( ! class_exists( 'MB_Custom_Table_API' ) ) {
        return;
    }
    MB_Custom_Table_API::create(
        'mb_ranks',
        $this->table_fields(),
        // array( 'email' )
    );
}

this is the input situation

public function your_prefix_register_meta_boxes( $meta_boxes ) {

$variable = $this->table_fields();
$fields = array();
foreach ($variable as $key => $value) {
    $fields[] = array(
        'id'   => $key,
        'name' => $key,
        'type' => 'range',
        // 'std'  => 1,
        'min'  => 1,
        'max'  => 5,
        'step' => 1,
    );
}

$meta_boxes[] = array(
    'title'        => 'Ranks',
    'storage_type' => 'custom_table',    // Important
    'table'        => 'mb_ranks', // Your custom table name
    'post_types' => ['projects'],
    'fields'       => $fields,
);
return $meta_boxes;

}