Hello Daryl,
Centrify Express is assigning UID/GID to AD Users and AD Groups using an algorithm that generate 9-10 digits long numbers. The fact the Users are ending with nobody/nobody is typical of a system that does not support 32bits UID/GID and so consider those long numbers to be 65535 (generally attributed to nobody).
Can you confirm your system is supporting 32bits UID/GID?
Cheers,
Fab