Boolean field with single on/off widget stays required even when user has no view/edit permission

On my registration page i have a custom field where anonymous users don't have view and edit permission.

However without seeing this field, upon saving the registration page the user gets a drupal message: ' 'my custom field is required'.

I have found this behaviour only when the field is a boulean type with a single on/off widget.
As soon as i take a different field or make it a radio button/checkbox widget type the user can save the registration page without the message.

Additional info:
I could make the field 'not required' by unchecking the checkbox on the fieldsetting however i need the field to be required on the user-edit page.