Hi,

Thanks for reporting. We will fix it in next update.

The quick fixing:
1) find /themes/arnold/woocommerce/loop/loop-start.php, repace as the code:

<?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 	    http://docs.woothemes.com/document/template-structure/
 * @author 		WooThemes
 * @package 	WooCommerce/Templates
 * @version     3.3.0
 */
?>
<div class="main-list columns-<?php echo esc_attr( wc_get_loop_prop( 'columns' ) ); ?>">
	<div class="main-list-inn clearfix">

2) Please paste the custom CSS code to “Appearance > Customize: Additional CSS”:

.woocommerce.archive .main-list.columns-4 .product-item { width: 25%; }
.woocommerce.columns-2 .product-item, 
body.post-type-archive .product-item,
.woocommerce.archive .main-list.columns-2 .product-item { width: 50%; }
.woocommerce.columns-3 .product-item,
.woocommerce.archive .main-list.columns-3 .product-item { width: 33.3333%; }
.woocommerce.columns-1 .product-item,
.woocommerce.archive .main-list.columns-1 .product-item { width: 100%; }
.woocommerce.columns-5 .product-item,
.woocommerce.archive .main-list.columns-5 .product-item { width: 20%; }
.woocommerce.columns-6 .product-item,
.woocommerce.archive .main-list.columns-6 .product-item { width: 16.6667%; }
.woocommerce.archive .product-item {width: 33.3333%;}
.woocommerce .main-list { margin: -20px; }
.woocommerce.archive .main-list { margin: -20px; }
.product-item .inside { margin: 20px; }
@media (max-width: 768px) {
	.product-item,
	.woocommerce.columns-3 .product-item,
	.woocommerce.columns-1 .product-item,
	.woocommerce.columns-5 .product-item,
	.woocommerce.columns-6 .product-item,
	.woocommerce.archive .product-item,
	.woocommerce.archive .main-list.columns-1 .product-item,
	.woocommerce.archive .main-list.columns-2 .product-item,
	.woocommerce.archive .main-list.columns-3 .product-item,
	.woocommerce.archive .main-list.columns-4 .product-item,
	.woocommerce.archive .main-list.columns-5 .product-item,
	.woocommerce.archive .main-list.columns-6 .product-item { width: 50%; }
}

@media (max-width: 480px) { 
	.product-item,
	.woocommerce.columns-3 .product-item,
	.woocommerce.columns-1 .product-item,
	.woocommerce.columns-5 .product-item,
	.woocommerce.columns-6 .product-item,
	.woocommerce.archive .product-item,
	.woocommerce.archive .main-list.columns-1 .product-item,
	.woocommerce.archive .main-list.columns-2 .product-item,
	.woocommerce.archive .main-list.columns-3 .product-item,
	.woocommerce.archive .main-list.columns-4 .product-item,
	.woocommerce.archive .main-list.columns-5 .product-item,
	.woocommerce.archive .main-list.columns-6 .product-item {
		width: 100%; 
	}
}

Regards!
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