Hello @tannie143,
Welcome to the PayPal Community! I can certainly understand how seeing an unexpected transaction on your Activity would be a bit concerning. A transaction beginning with "O-" is normally just an Order which is an agreement between the buyer and seller before the authorization of the actual transaction. In this case, it sounds like the Order for the original transaction in September may never have been closed out by USPS. Normally, the order is changed to "Completed" after the authorization and transaction is finalized. From time to time, it may stay as "Pending" or "In Progress". As long as the original authorization and transaction were completed without any hiccups, this is going to be just a cosmetic issue, but you're welcome to reach out to our Customer Support teams to see if it can be voided. You can also read more about Orders and Authorizations here.
I hope that helps!
- Jon K
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