Because they are disabling the feature to make fields private. I received an email today:
Update on Careers 2.0 Profiles:
We've decided to discontinue a feature that allows Careers 2.0 candidates to mark individual fields of their profile as private. We've noticed that you're profile is currently designated as public, but has at least one field marked private. In order to be sure your privacy is protected, we will be marking yours and all other profiles that are using this feature as private by Friday, July 6th. If you'd prefer to keep your profile public, you can designate it as such by editing your profile and either:
- Uncheck any individual fields currently marked as private
- Delete any information in fields you have marked as private
If no action is taken, all of your profile information will become private on Friday, July 6th. At any point after that date, you'll still be able to change your profile settings and make it public if you wish.
Please let us know on Meta Stack Overflow if you have any questions or concerns (and remember to tag it with Careers so we see it).
Product Manager - Careers 2.0
Although I think that this is still partially a bug. you should be able to mark your currently-private fields as public. Once everything is public, the profile is safe from hiding.