This is a pretty well-known bug and it, in all cases but just now, doesn’t really do anything.
What appears to happens is that Safari will appear to display the wrong text in a form’s text box. In MovableType [not to say this is a bug in MT: it’s just really easy to see it there ] this is easily reproducible: if you delete a comment, the comment’s text is displayed as the original entry text, but I have never seen it save that as the entry. Until just now.
Bad karma, I suppose, since I was so snarky about Timothy Appnel’s double-post: his duped comment was the one I deleted, and that put his comment text in place of my entry text.
Fortunately, since I compose posts in ecto, I could republish the original post. What a nuisance.