For one of our sites, every time a page is created or modified then submitted for the required approval, we need to go to the page list and check the page in before it can be approved.
I could be mistaken but I believe this has to do with the Versioning Settings. I've checked the list settings and see "Require documents to be checked out before they can be edited?" is set to NO. I'm not sure what other setting would check a page out and prevent it from being approved.
