Woocommerce products from category loop

In Woocommerce, I Need some help with this custom product loop, in my code my result is : how it looks like

The loop doesn't stop and it is looping the same products for three or four times.

The code I am using is here :

<div class="container">
    <div id="default_products_page_container" class="wrap wpsc_container">
        <?php
            remove_action( 'woocommerce_before_shop_loop', 'woocommerce_catalog_ordering', 30 );
            remove_action( 'woocommerce_before_shop_loop', 'woocommerce_result_count', 20 );
            $cat = get_query_var( 'product_cat' );
            $args = array( 'post_type' => 'product', 'posts_per_page' => 5, 'product_cat' => $cat, 'orderby' => 'rand' );
            $loop = new WP_Query( $args );
        ?>
        <div class="wpsc_default_product_list">
            <?php
            while ( $loop->have_posts() ) : $loop->the_post(); global $product; ?>
            <div class="col-lg-4 col-md-4 col-sm-12 col-xs-12">
                <div class="default_product_display product_view_<?php echo get_permalink( $loop->post->ID ); ?>group">
                    <a href="<?php echo get_permalink( $loop->post->ID ) ?>" title="<?php echo esc_attr($loop->post->post_title ? $loop->post->post_title : $loop->post->ID); ?>"/>
                    <?php if (has_post_thumbnail( $loop->post->ID ))
                    {            
                    ?>         
                    <div class="product-image-thumb"> 
                        <img src="<?php echo the_post_thumbnail_url( $loop->post->ID );?>"/>
                    </div>
                    <?php
                    } else 
                    {?>
                    <div class="product-image-thumb">
                        <a>
                            <img src="<?php echo woocommerce_placeholder_img_src();?>"/>
                        </a>
                    </div>
                    <?php } ?>
                </div>
            </div>
            <?php endwhile; ?>
        </div>
        <?php wp_reset_query(); ?>
    </div>
</div>