Fingerprint Scanner allows 3 registered plus a deleted fingerprint to unlock Bug

[kinji5]

I registered 3 fingerprints on the note 4 and a day later I decided to change fingerprint 2 out with a new finger. Now all four fingers will work to unlock the phone even though it says only 3 can be registered at the same time. I have restarted the phone many times since then.
This makes me feel like the phone security feature is not implemented very well to have a bug such as this.