Redmi phone jumps back to 15 seconds after adjusting the lock screen time

Hello.

Have you obtained root permissions on your phone? This may be caused by a conflict with an application. Please back up the important data in your phone (contacts, text messages, notes, etc.), and then open the settings. ~Backup and Reset~Restore factory settings. Try again to see if the phenomenon still exists.

If this phenomenon no longer exists, it may be that the application you downloaded is conflicting. I suggest you check it carefully.