I just noticed that one post title has the word "standard" appended to the right, where "draft" might appear in the case of an unpublished post.
This post is published (since mid-october), displaying properly, has tags, an author, etc. It is the only post that has "standard" appearing next to the post title in my list of posts in the dashboard.
Does anyone know what this means?
Update: I deactivated all my plugins in order to troubleshoot, but this did not make a difference. The word "standard" still appears next to the one post title.