When a page restricted to a single user can still be edited by another user with administrative rights, the second user is able to enter the edit mode though any changes cannot be committed through the save button. Not permitted message is prompt in the interface.

Steps to reproduce:

1. Create an user called: admin1 that belongs to confluence-administrators group.
2. Create an user called: admin2 that belongs to confluence-administrators group.
3. Logged as admin1, create a space, with a page.
4. Log as admin2, and go to this specific page that admin1 created, and add a Edited restriction so only admin2 can edit.
5. Log as admin1, and go to this specific page.
6. You'll see that you can see the "Edit" button, but if you make any changes, and click on save, you will get the "Not permitted" message.

Workaround:

> There isn't a workaround.