WHY???? IMEI and Serial on Sam based Rom are ok but on CM11 - CM12 no

Hi all,
i don't have find any solution at this problem. If i flash stock rom the phone work fine, if i flash a rom based on stock are ok but if i flash any CM based rom or CM rom i have no working phone. ONLY EMERGENCY. With phone INFO all is ok with Stock ROM IMEI and serial are correct but if i flash a CM 12 rom o other non based SAM rom i don't have IMEI and my phone stop to work. ONLY EMERGENCY MODE. There are some solution to this problem? I post some screenshot of my actually rom work fine. Thanks.