No "create" permission on custom profile fields

Hi,

I am encountering a strange problem on custom (core) profile fields:

While every field permissions work nicely on all content types, I do not get the option"Create own value for field xxx" on core profile fields. All the other permission settings are there (edit and view). It is just the very first one that is missing.

This concerns the field edit page only. The permission actually is there and can be changed via the general permissions admin page.

However, the above mentioned fields that have the create option missing on the field edit page always seems get the "create" permission to anonymous users by default which needs to be changed lateron via the persmissions admin screen.