Thank you for alerting us about this. It seems that our staleness filter has caused your listings to be removed from the site. This filter goes into affect if listing information hasn't changed at all for a specified period of time.
I've set your listings back to an active status however, so they should be live on our site again within approximately 24 hours. If there are any that are still missing after that time, please access the link below and contact our Customer Service Team about the issue.