You have had your NetCommunity site scanned to provide a list of all page URLs. In the list of all page URLs you may see duplicate page URLs with the duplicate showing deliverychannelID= at the the end of the page URL. For example, page URL of www.yoursite.com/page may show a duplicate URL of www.yoursite.com/page?DeliveryChannelID=123a4567-890b....
The URL will display based on the way the content is being viewed. If we are viewing the content over mobile, we may see the mobile channel ID in the URL listed as ?deliverychannelID=. This is not a duplicate page on the site, this is an ID added onto the existing page URL.