Password expires in 14 days but can not change it until last day

We have server 2000 and windows 2000/XP Pro PC’s. We get a meesage that the password ( windows logon ) expires in 14 days, if you try to change the password it wont change. It will let you change the password on the last day only.
In group policy > windows settings > local policy > security options > prompt user to change password = 1 days.

Thanks for any help