Repeatable fields sortability

I’m wondering if the drag-ability of repeatable fields has some hidden sort value? I cannot figure out where the sort is stored; I did a print_r of the simple_fields_fieldgroup() and couldn’t find it.

As a workaround I’ve had to put a sort field in, and manually update it. Surely there is a better way?

Here is my code currently:

// now get simple fields. They may not be in the right order, so we build an array using the sort value
		$mysimple_fields_values = simple_fields_fieldgroup('sections' );
		//dprint_r($mysimple_fields_values);
		$simplevalues = array();
		foreach ($mysimple_fields_values as  $value) {
			$simplevalues[$value['sort']] = array(
				'anchor'=>$value['anchor'],
				'subsection_class'=>$value['subsection_class'],
				'subsection_content' => apply_filters('the_content', $value['subsection'])
				);
			}

		$count_of_fields = count($mysimple_fields_values);
		for ( $x = 0; $x <=  ($count_of_fields); $x++) {
			echo $simplevalues[$x]['sort'];
			$my_anchor = $simplevalues[$x]['anchor'];
			if ($my_anchor == '') {continue;}

			$my_subsection_class = $simplevalues[$x]['subsection_class'];
			$my_subsection_content = $simplevalues[$x]['subsection_content'];

			echo "<a name='$my_anchor'></a>";
			echo "<div id='$my_anchor' class='subsection $my_anchor $my_subsection_class'>";
			echo $my_subsection_content;
			echo "</div><!-- /$my_anchor -->\n";
			echo '<div class="clear"></div>';
			echo "\n\n\n";

		}

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