Be sure to add your own custom AOVs and name them correctly first if you intend to add another default or other Display from the presets (the blue menu icon to the right of the Display title contains three presets) otherwise your naming may become incorrect and settings will be forced to be shared if you add them before or during your creation of custom AOVs.

tl;dr Add default displays from the Display menu (if so desired) after all other displays and channels are added to avoid problems.