Password on boot at the beginning

[BigBan123]

Hello everyone! I installed lineage os 14.1-20180212 on my new oneplus 5. Everything is ok but i can't understand one thing. On my previous oneplus one i had cyanogenmod and when I rebooted my phone or turned it on it always asked me password before I saw lock screen, where I should retype password again. I mean that on oneplus 5 after I make reboot or turn it on , I see the same screen if I just lock it as push once power buttom. Is it OK? Is it the same as on oneplus one? I am worry about encryption on it.