I insert three of the five ebay user links at the end of all listing descriptions. They are available via the 'User Links' option within the Item Description section.
Recently checked mobile friendliness on my listings and found the following error on every listing containing the user links:
"We found non-compliant links in your listing For a link to open correctly, the target must be defined to open in a new tab or window by setting a '<b>target="_blank"<b>' attribute to the link definition. If you do not define the target accordingly, the link may not open successfully"
Allowed ebay to fix the problem and found that every error was specifically related to the 'View My Other Items For Sale' link.
Auctiva does not have the proper target="_blank" html code assigned to that particular link.
Should be an easy fix for Auctiva. But will need to correct all new listings via html before posting or eliminate using the link until issue resolved.