[MM3-users] Hyperkitty Replies showing up as new posts

Hello, my Hyperkitty is creating a new post for each reply in a thread. I would expect that new posts to a list would show up in the archive and once you click on that thread you would see all replies. However in my Hyperkitty each reply to a thread shows up as its own post usually with the subject line saying RE: Original Message. How can I set up Hyperkitty to behave more like the lists.mailman3.org archives where replies to topics are filed under their respective threads?

Thank you, Paul 'Arte Chambers' Robey 502-408-6922