[Samba] Result of "net rpc user info" differents from "net ads user info"?

[Iap, Singuan]

I have tried for several accounts (below is one of them), 
"net ads" always reports less 1 item than "net rpc"? (The result of "net
rpc" is same with the AD's setting)

Any hints?
Thanks in advance.

Iap
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# net rpc user info rdadmin -Uusername%password -S2003ad
Thecus-RD
Domain Users
Domain Admins

# net ads user info rdadmin -Uusername%password -S2003ad
Thecus-RD
Domain Users

# net -V
Version 3.0.9