Invoices auto number issue

Hello,
Kindly note that one of the users has changed the auto invoice numbering, so it is coming in high numbers now, I changed all invoices’ numbers to be in serial again, but new ones are still coming with the last high auto number, can you please advice how to solve?
Thank you!

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You need to check all the numbers you have used, the Manager reads all the Digits in the Reference as sequential numbers.

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P1-2 will be 12, and the next automatic number will be 13