Thousands of android users having this problem, when you install custom ROM and then you try to reset your phone; it keep rebooting into TWRP recovery (not system), even after you flash your ROM again.
So here's the solution: https://www.youtube.com/watch?v=vSWC5MAB5cE
So here's the solution: https://www.youtube.com/watch?v=vSWC5MAB5cE