A site I'm working on has an odd problem: two sets of "posts" menus in the admin. The client brought me on board and says "it's been there a while". How would I go about finding out why there are two sets? The site was brought into WordPress from Drupal. I created the theme, but the client was active in bringing content over. How we got a duplicate "posts" menu I do not know, and neither does he.
Where would I start with figuring this out? I've been trying deactivating and reactivating plug-ins and have had no clues in that regard.