Strange invoice created before I finished it

[TiasTreasures]

I just created an invoice for eight items with a shipping discount of $17.71

When I finished, I found TWO invoices listed. One is #319448, with zero in the Purchases Total and $-17.71 as the invoice total, somehow generated four minutes before I finished. The correct invoice was also created, Invoice #319449, which has the correct shipping discount, correct invoice amount, and my note to the buyer at the bottom.

I sent a note to the buyer to ignore the one with the negative balance, and, of course, apologized.

Not a show-stopper, but troubling, so I'm reporting it.

[burgyeb]

My last sale,buyer paid before invoice sent. I tried to print shipping label via Paypal, and the charge was 3 times correct amount. Ended up having to ship from the post office. My net payment received would have been a negative amount.Had a feeling something was wrong with the shopping cart, invoice, or something.