My lock screen type was finger print on galaxy note 4. I changed it to password but when i lock my phone i can open it by swipe. The worst thing is that i can not change the type of lock. When i go to settings> lock screen it writes that phone is secured with password but it can be opened with swipe. And when i want to change lock type i can't It says that your password is incorrect although i'm sure its correct Help me please

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