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Samsung NOTE 4 Android 6.0 lock screen setting stuck in "Secured with PIN" but unlocks with swipe

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AC Question

Samsung NOTE 4 Android 6.0 lock screen setting stuck in "Secured with PIN" but unlocks with swipe

Samsung NOTE 4 Android 6.0 lock screen setting stuck in "Secured with PIN" although actuall lock sreen is "Swipe".
Problem started when I wanted to set a PIN lock screen, I don't remember what went wrong but now my phone lock screen is still "Swipe" but settings show "Secured with PIN". I AM able to unlock my phone by swiping.
When I want to change it phone asks me to "Confirm PIN". No matter what I enter (I remember which PIN I tried to set but it does not work) phone replies "Sorry, try again".
Is factory reset the only way to solve my problem?