Exclamation Mac changed after flashing CloudyG3/PA/Mahdi

Hello everyone,
whenever I flash CloudyG3, Paranoid Rom or Mahdi, my mac adress changes to f0:27:65:e5:98:3f.
My install routine was like the following:
- flashed kk stock modem
- formatted system, data, cache, dalvik
- flashed the rom
- flashed the 4.4.3 gapps
I also tried to flash the rooted stock rom before I've flashed mahdi, but the problem was still there.
Now I want to know how I can prevent my mac from changing or how I can change my mac permanently.
Thanks in advance!