Default value in password box

When I try to create a new content and click the save button, I receive a message that says the passwords doesn't match (for protected node), since I have not chosen the protected password for this new node and also I have not entered any character in the first box for password, I think this needs to be fixed.
I think the problem is that the first password box has some characters by default and it shouldn't be.
Thanks in advance for helping