tom_wordpress on "[Plugin: WooCommerce - excelling eCommerce] Product Stocks not reducing after Completeing an Order"

Once I ordered a product and set its status to "Complete", the product stocks is not reduced. Same problem as "Reduced Stocks" order actions.
I am currently using the latest version of Woocommerce. (1.6.6)

http://wordpress.org/extend/plugins/woocommerce/