The orders originally appeared in Selling Manager Pro, but then disappeared and at one time with orders showing at a not very impressive minus 1.
We don’t know if this is a very isolated glitch and eBay seller protection is kicking in, cancelling orders from a dodgy buyer, or if it’s a more widespread site issue. However we’d recommend checking off your orders against your eBay and PayPal account to ensure they marry up and you’re not shipping goods which have been refunded.
Any more information would be gratefully received, please add in comments below.
Edited to add: eBay and PayPal have between them discovered the cause of the problem. During this morning’s maintenance period some orders that were paid for were within a few seconds reversed in PayPal and eBay never updated the orders to show them as unpaid. Of course the buyers would likely have assumed that they had actually paid.
eBay support haven’t been that helpful and have eschewed all responsibility saying it’s a PayPal problem. PayPal say that it’s an eBay problem but for the seller we’ve been speaking to have said they’ll take a look at putting things right as it’s a relatively small amount of money. We’d still advise checking to see if you have any unpaid orders.