Mac randomization is enabled by default. You'll have to check your saved networks in wifi settings, where you can disable mac randomization for each network.
it's not that.. i know about mac randomization (because my router is mac address whitelisted and first time, in windows i think, i needed some time until i got it).. anyway, in your rom, i configure it (turn off random) in network specific and even global system settings.. but it's real the "physical" mac that changes..
i had this problem first when i installed paranoid quartz 5.. i tried a lot of things until i got none mac at all and no wifi turning on (even with network settings reset, wipe all, factory reset)... after all i kind of brick the phone.. after some days and tries i got to recover it with last stock rom (miui global).. and voilá.. correct mac address!
today i installed your rom and my real mac address got away again (it's not my phone original but it's the same i had with paranoid... what it's strange for me).. guess stocks and customs got macs in different places?