Confused by Profile Fields

This is for Store Builder version 4.17.2 (our test/dev install).

Question/confusion #1:
Why does the Profile Fields admin show 3 unlabeled sections? Is this by design or is there something wrong with our setup? The first section contains Contact Information fields, but I’m surprised there is no label displayed. The second and third section both show Billing address/Shipping address fields but the lists are not identical, so I don’t understand what the difference is supposed to be and how they are used.

Question/confusion #2:
All of the required profile fields need to be set if I try to create a new Administrator even if they are assigned to specific Storefronts. Is there a way to limit profile fields to Customers only and not use them for Administrators?

Question/confusion #3:
Why do required profile fields from a different storefront need to be assigned to an Administrator for a different storefront?

In the following image, I show the selected Storefront. The first two Contact Information fields shown are assigned to two different stores, so why do I have to assign them while trying to create this new Administrator account?

We failed to reproduce points #1 and 3 on the clean installation

As for point #2, unfortunately the same set of profile fields is used for administrator and customer accounts