Typepad is upgrading it's platform so you'll see some changes over the next few weeks. You've already seen a few significant changes to the commenting system. I really like the new function that allows you to respond to comments via email.
But in the process of migrating their systems there are some weird little quirks popping up (i.e., why does it say I have a post on December 30). Just ignore them. I'll scream at them on your behalf.