Hi,

Please go to Appearance>Theme Editor, replace Air theme/woocommerce/loop/loop-start.php by the codes:

<?php
/**
 * Product Loop Start
 *
 * This template can be overridden by copying it to yourtheme/woocommerce/loop/loop-start.php.
 *
 * HOWEVER, on occasion WooCommerce will need to update template files and you
 * (the theme developer) will need to copy the new files to your theme to
 * maintain compatibility. We try to do this as little as possible, but it does
 * happen. When this occurs the version of the template file will be bumped and
 * the readme will list any important changes.
 *
 * @see         https://docs.woocommerce.com/document/template-structure/
 * @package     WooCommerce/Templates
 * @version     3.3.0
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}
?>
<div class="products main-list columns-<?php echo esc_attr( wc_get_loop_prop( 'columns' ) ); ?>">

Replace Air theme/woocommerce/loop/loop-end.php by the codes:

<?php
/**
 * Product Loop End
 *
 * This template can be overridden by copying it to yourtheme/woocommerce/loop/loop-end.php.
 *
 * HOWEVER, on occasion WooCommerce will need to update template files and you (the theme developer).
 * will need to copy the new files to your theme to maintain compatibility. We try to do this.
 * as little as possible, but it does happen. When this occurs the version of the template file will.
 * be bumped and the readme will list any important changes.
 *
 * @see 	    http://docs.woothemes.com/document/template-structure/
 * @author 		WooThemes
 * @package 	WooCommerce/Templates
 * @version     2.0.0
 */
?> 
</div>

Regards!

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