I'm having some odd commenting behavior with the Mid Century template set on my long running blog. I don't have them on my Sandbox development blog on the same MT installation.

When you visit the page, the comment form is visible and the 'sign in to comment' is visible. Should it be one or the other?

After a comment is posted, the entire entry is reproduced with the comments (including the new one) at the bottom. A page refresh clears it up.

The blog was originally created in MT 2.661 and upgraded to 3.15, 3.2 and 3.33 before going to 4.21. My previous templates were a messaged version of the MT 3.2 or later templates. I converted to Mid Century earlier this month. My sandbox blog is a brand new blog created in MT 4.21. My MT 4.21 install is a fresh one, not an overwrite of the old MT 3.x install. I checked the templates in my old blog vs. the new Sandbox blog and they are identical.

Any ideas on what's going on here?

Feel free to try a test comment on this entry on my main blog or in my sandbox blog.