I haven't had a feedback issue, but I've had a couple of combined orders where one of the items will unmark itself as being posted. I nearly had a heart attack the first time it happened thinking I had forgotten to post something. Then I remembered I had, so I marked it as posted again. Refreshed the page and the other 3 things in the order were then unmarked as posted. So, I marked them as posted again and the first one unmarked itself. I left it alone after that because the tracking number said it was delivered and I assumed the buyer was getting all these emails saying their items had been posted......multiple times!