problems with roster of new users

Hello,

i have an ejabberd-1.1.3 server with some 40 users which seems to work fine, but ....
Month before i created a shared roster group "everybody" by using the tutorial from www.ejabberd.im.
If i now register new users, they see only 4..5 from 20 online users in there roster.
I tried this accounts with different jabber-clients like kopete, jabbind and pidgin but all are showing the same short roster.
If i tell the client to show all offline buddys i see the whole list, but most of the users are incorrect flagged offline.
How could i debugg this problem ?
Has somebody seen this before ?

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