Here's a weird one.
One of my carts is creating an order with an old order number and sends me the email but when I go to the cart, the order isn't there and neither is the customer.

It has done this 3 or 4 times in the last year and it always uses the same order number - 2006030016 - this particular order number was used ages ago.

Its a valid order but it isn't registering in zencart properly.

Anyone know why it does this and how to fix it?

This cart is 1.3.5

Debbie