Hi Hein,
You have 2 cloneable fields, so when you use the shortcode to output, each of them will output in a unordered list.
To fix this, please use this PHP code instead of shortcode:
$texts = rwmb_meta( 'text_1' );
$urls = rwmb_meta( 'url_1' );
if ( ! empty( $texts ) ) {
echo '<ul>';
foreach ( $texts as $k => $text ) {
echo "<li><a href='{$urls[$k]}'>{$text}</a></li>";
}
echo '</ul>';
}