lenovo k3 note mac address auto changing


dear friends i got lenovo k3note with problem wifi not working……… and i check wifi working……… when change mac filtering enabled in router then wifi not working after checking mac address in mobile is ok……. when mobile is manually restart or wifi disable enabled previous mac address is changed give me a solution for that
how many time we restarting mobile or wifi enable disableing mac address is automatically changing for example mac address is 00:e8:15:0e:22:8e……..after restart or wifi enable or disable mac address auto chage like this 00:e8:15:fd:2b:e8 🙁