Hi @florianprokop!
where are these 7 orders?
This is marked as resolved but yours is a good question and the explanation about why order numbers are not sequential could be helpful to others.
An order is a custom post type ‘shop_order’ and its main record is stored in the wp_posts database table together with blog posts, pages, products, and images.
All records in this table have a unique ID, and the order number is the same as this unique ID.
If a product is added to your store in between orders, this will also be considered as a post and a record for it will be created and assigned the next unique ID in sequence. If the product has an image (which it will, in most cases), then this image will also have its own record and ID. The same applies to new pages. This can cause the order numbers to be non-sequential.
If you have any other questions please feel free to open a new topic.
Hope this helps!
