Why CM13 of Oneplus 2 resets itself Setting Show pattern dots?

I found out that CM loses often its setting about the visibility of security dots in the lock screen.
This is frustrating because I am using 6x6 net with a difficult pattern. It is challenging to pass the login.
Cases where I have seen that CM forgets the setting

1. Install any app of unknown sources etc Amazon underground


2. Leave the setting of unknown sources open

I managed to pass the code without the dots after 20 attempts. The phone had reseted the setting Show pattern dots.
Other changes in the phone

• I see only the dot pattern in the lock screen, nothing else; before, I saw Camera and Phone at the bottom bar in Fig. 1

Fig. 1 Lock Screen now, Fig. 2 Settings in Lock Screen View 1, Fig. 3 Settings in Lock Screen View 2

Phone: Oneplus 2

OS: Cyanogenmod 13