I made this mistake on a new project I'm working on.
I imported the pages into Kentico using the Import tool... Enabled a simple workflow to enable archiving and versioning... Then later changed a value in the raw database. The field is correctly displaying on our website, but in the admin, the fields aren't correct.
All I did to fix it was to go to the "Listing" area of Pages, and Archive all the problem pages (Selected the parents, and included children), then Publish them again.
In my case, all the pages were published already, so I didn't have to worry about things that were deactivated... So, keep that in mind, depending on your situation. Also, I did this successfully in v9.0, but i checked an instance I have in v8.1.9, and it seems to have the same options.