Thanks for your replies to this thread, everybody! I wanted to post the resolution here. I finally got the "official" answer after multiple emails to customer service. The email I received from them is below. So we just wait and the auto feedback will catch up in a couple of days.
Hello,
The automated feedback service became backed up over the weekend and it is now up and running at full speed again. All of your due auto-feedback should be caught up and left in the next couple days.
We apologize for the inconvenience and we appreciate your pateince with regard to this matter.
Thank you,
Auctiva Support