Bug: Color Picker field is showed below the Title field

Hello I created a color picker but it is showed below the title, please see the image:

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I think is because Z-index porperty

teh code is the follow:

add_filter( 'rwmb_meta_boxes', 'your_prefix_register_meta_boxes' );
function your_prefix_register_meta_boxes( $meta_boxes ) {
    $meta_boxes[] = array (
        'title' => 'Características',
        'id' => 'Proyecto_Caracteristicas',
        'post_types' => array(
            0 => 'proyectos',
        ),
        'context' => 'after_title',
        'priority' => 'high',
        'fields' => array(
            array (
                'id' => 'logo',
                'type' => 'single_image',
                'name' => 'Logo del proyecto',
                'force_delete' => 1,
                'tab' => 'car_generales',
            ),
            array (
                'id' => 'img_principal',
                'type' => 'single_image',
                'name' => 'Imagen Principal',
                'required' => 1,
                'tab' => 'car_generales',
            ),
            array (
                'id' => 'color_principal',
                'name' => 'Color Principal',
                'type' => 'color',
                'size' => 7,
                'required' => 1,
                'tab' => 'car_generales',
            ),
            array (
                'id' => 'color_secundario',
                'name' => 'Color Secundario',
                'type' => 'color',
                'size' => 7,
                'required' => 1,
                'tab' => 'car_generales',
            ),
        ),
        'tab_style' => 'left',
        'tabs' => array(
            'car_generales' => array(
                'label' => 'General',
                'icon' => '',
            ),
        ),
    );
    return $meta_boxes;
}