OpenFire Group Size

After I reached 1563 Roster members (AD Group), I can't see any users in my "Jabber" group on OpenFire "Groups" page. And the Roster on clients is empty too (Pandion, Miranda)

>dsget group "cn=Jabber,cn=users,dc=spbaep,dc=local" -members | find /c /v ""

1563

Server groups:

1      Jabber             0

2      Jabber2           1238

I found that the 1501`st ad group user collapse shared group to 0 members