Sometimes a calyx's pistils don't pop-out, giving the appearance of being a single nanner. Usually, the pistils will eventually pop-out. Be damn sure this is not the case before you start killing your plant. (death by a thousand cuts)

Cutting single buds off as nanners occur, is adding more and more stress. If it really is a hermie, I'd ditch it before it pollinates your other ladies. Nanners can form in the buds themselves, too.

Segregating a plant in pollen doesn't do any good in the same house. Pollen can be transported on your clothes, blown around by fans and air conditioning...