When you drill down to the individual message level in the queue detail you may see deferral events for multiple recipients on different domains.
What you are seeing is by design.
When you use the queue detail to drill down to the message level, the deferral logs are scraped for any events for that particular Message ID or any domain level events for that domain. When you submit a message with more than one recipient, Hurricane Server has to split that up into multiple messages (one for each recipient). Since all of these individual messages came from the same original message, they all have the same Message ID. Thus the queue detail message level view shows deferral activity for any of the recipients of the original message.