Pin Not Working!

[AC Question]

Everytime I set up a pin the same pin won't work when I type it in. After changing my lock screen to swipe I can't change it back because it requests a pin, but it denies the pin I always use.

 

[B. Diddy]

Welcome to Android Central! Which phone? So you've been able to set up a different PIN, but it never recognizes it when you try to type it in again? How are you able to change the PIN, since it should be asking you to enter the existing PIN first in order to change the security settings?