Constant Content

When I was first publishing my articles I selected best offer because, Why not? Unfortunately, now I know why not because I seem to be unable to unselect the Best Offer Tab. I click it, the little checkmark goes away, but as soon as I save, it comes back. I have tried dozens of times, and nothing seems to make it stay away.
Has anyone else had this problem, and have any tips to make the best offer option stay unchecked?