Actually I don't think it has anything to do with Auctiva (unless you have an Ebay store). This is just Ebay and their indexing and it happens to all of us
Sorry, forgot to add, it happens even if you DON'T use Auctiva.
When you block a person, they can no longer invite you to a private message or post to your profile wall. Replies and comments they make will be collapsed/hidden by default. Finally, you'll never receive email notifications about content they create or likes they designate for your content.
Note: if you proceed, you will no longer be following .