I can log in with my password if I lock screen or logged out from my account. But, I can't unlock authentication in users & group system preferences. It's kinda bother me because I can't uninstall or install app in my mac without this. I did changed my username account once, I wrote down and I believe I did everything correct. It seems the system preferences don't recognize my username somehow. I'm pretty sure 100% is not about my password because I can log in my computer when it's logged out.
