Bootloader unlocked and tampered flags set to true even after flash; unlocked before

When I got my OPO, cm 11s, I unlocked the bootloader and rooted. In preperation for 12.1, I flashed the cos 12 factory image and basically left it, waiting for 12.1. Today I installed 12.1 using the stock cyanogen recovery, and then wanted to root it. (all drivers are set up properly) I tried fastboot oem unlock but nothing happened, phone didn't get wiped; it just said task finished, 0.0 seconds. Then I did fastboot oem device-info and it returned "Device tampered: true" and "Device unlocked: true". So it thinks the bootloader is unlocked, even though it's not. And so the oem unlock command doesn't work. How can I reset the flags?