I have the same problem using Litespeed Cache and WP Statistics 13.1!
But if after more than 6 months the developer has not replied yet, then I guess there is not much hope!
That doesn’t seem to work for me. I have deleted all orders that were created in the development phase, but whenever I place another order it will go to the next number (1084) and will not start at the number again that I have set in the Sequential Order Settings as the start number (1001). What can I do?