Double numbering orders for one order

http://open-tools.net/forum/advanced-ordernumbers-for-woocommerce/5549-double-numbering-orders-for-one-order.html#8384

Apparently, two _oton_number_ordernumber are assigned to the same order...

Plugins installed by both bug reporters:

• Contact Form 7: por Takayuki Miyoshi – 4.9
• Regenerate Thumbnails: por Alex Mills (Viper007Bond) – 3.0.1
• WooCommerce Basic Ordernumbers: por Open Tools – 1.4.3 – Not tested with the active version of WooCommerce
• WooSidebars: por WooThemes – 1.4.3
• Yoast SEO: por Team Yoast – 6.0
• YITH WooCommerce Wishlist: por YITHEMES – 2.1.2 – Not tested with the active version of WooCommerce