LDAP filter memberOf

Hello
Installed version seafile 6.0.5 CE, following problem when you configure LDAP:
current settings:
HOST = ldap://MYDOMAIN.COM
USE_SSL = false
BASE = OU=VC, dc=MYDOMAIN,dc=COM
USER_DN = user@domain.com
PASSWORD = ХХХХ
LOGIN_ATTR = userPrincipalName

When viewing the available users displayed in the admin panel is active Directory (very much) (fig 1)

Do filter sample of users from a specific group:

FILTER = memberOf = cn = drive, ou = vc, DC = MYDOMAIN, DC = com
In the admin panel displays not all users in this group.

At the same time while watching the same group in AD displays all users in this group

what happens to the other users?
What can be wrong?

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