I think there is a small bug in Samsung's Note 3 Signature Lock screen in KitKat.
Please tell me if other people face this issue on theirs because it definitely happens on my Note.
1. Set up Signature Screen Lock from Settings. Also set up a backup pin.
2. Test it out by locking the phone and then using the pen to unlock.
3. Go back to Settings. Attempt to change the screen lock method. It will ask you for the backup pin.
4. Enter any bogus 4 digit number and it should accept it.
This bug is really small (if it even is a bug)....but I was bored and I thought I'd share it with you all.
Who uses signature lock anyway? :P