MacOS – When Organized by Conversation, Mail’s Inbox sometimes sends out to wrong recipient

When Lion's Mail Inbox is set to "Organize by Conversation", an odd behavior often occurs. If I hit Reply to the latest email from my correspondent, the recipient in the new email is me, not this correspondent.

I'm aware that any of the emails in the Conversation can be individually highlighted (seen as a blue line around that email), and that if this blue line is around one of the correspondent's emails, hitting Reply definitely sets the new email to be sent to this correspondent. However, if nothing is blue-highlighted, and I hit Reply, the new email is set to be sent to… me. Which of course isn't the objective.

Whew, that was harder to explain than the issue, but I hope my question is clear!