Hello @lanxalot,
That is an interesting situation. If you go to the products list and click on the sorting link at the top, does that order reflect the order set by the advanced > order number?

I tried on my test site and I could reorder these and have it reflected in the sorting. If you temporarily enable the Twenty Nineteen theme, is the sorting correct?
Let me know what you find out and we’ll go from there.
Thanks
Plugin Support
Con a11n
(@conschneider)
Automattic Happiness Engineer
Hi there,
We haven’t heard back from you in a while, so I’m going to mark this as resolved – if you have any further questions, you can start a new thread.
Kind regards,
Hello Con
Sorry for the slow reply. I was waiting to receive your response in my email inbox but it never arrived so I just now decided to come back to the WordPress.org support page.
Thanks for your reply message.Hopefully you will still see my reply even though the ticket has just been closed today.
Yes, if you check out my initial message, I mention that when I click on the Sorting tab it shows the products in the correct order.
Best regards
David
Hello, just to update in case anyone else reads this, it turned out to be a bug in Divi. Many thanks!