Replica ask for a new password over and over

Hello, We have a big problem here. We are using MacOSX 10.5.6 as a PDC for Windows PCs. We also have a replica/BDC on a remote location. Passwords are configured to expire every 60 days. When the password expire, people authenticating on the replica are asked to change their password at each login!!! Also, if i check "be changed at next login", the value is not clear if done on the replica.... Anyone have a solution to his very very big issue? Thanks a lot! Fred