Authorize.net AIM using wrong order / invoice number

Every now and then the invoice number that shows at Authorize.net does not match the one in Zen Cart, usually off by one digit. The last time it was one number LESS than the actual invoice / order number.

Any explanation for that?

Another order just came through and it was also one number less than the actual order number.

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No changes of any kind were done to an install that has been running for about a year now. The only thing I have done since the last correctly numbered order, was to delete an order that was placed between the correctly numbered order and the first incorrectly numbered order.

Anyway......went in to Store Manager and ran **Reset Current Order ID **in hopes of fixing it, then placed a new order with a credit card and the invoice number matches in Authorize.net and in Zen Cart. I will wait until the next actual order to see if that has "fixed" it.

Had a few more orders come in and the invoice / order numbers are still matching what was transmitted to Authorize.net so I guess that fixed it.