Order numbers are a big issue with WP/WooCommerce as every post or order or whatever item increments the post_id/order number; so, if you are adding new products automatically for example, the order number that the customer & shop_manager sees can go 1001, 1124, 1125, 1306, etc. etc. Totally random looking.
However, there are several plugins that ‘override’ the post_id /order number so it goes 1001, 1002, 1003, etc.
Please add support for one of these plugins - our preference is the Tyche plugin.
YITH and BeRocket and Webtoffee also have plugins. (I can only post 2 links).