Hello,
It looks that wc_get_stock_html dislays nothing.
You can try
add_action( 'woocommerce_after_shop_loop_item_title', 'xstore_stock_catalog', 10 );
function xstore_stock_catalog() {
global $product;
if ( $product->is_in_stock() ) {
echo '<div class="et-stock" >' . $product->get_stock_quantity() . __( ' in stock', 'xstore-child' ) . '</div>';
} else {
echo '<div class="et-out-of-stock" >' . __( 'out of stock', 'xstore-child' ) . '</div>';
}
}
Regards