When adding user groups to site, some groups are grayed out

[audriusp]

Hello, when adding user groups to site, some groups are grayed out. those groups are not added already, i know that  could be the issue. what could be other issues?

[audriusp]

Hello,

There is some warnings regarding LDAP

2017-05-08 00:04:18,147 WARN  [org.alfresco.repo.security.sync.ldap.LDAPUserRegistry]
 [DefaultScheduler_Worker-10] Failed to resolve member of group 'Alfresco_Users' with distinguished name:
 CN=Name Surname,OU=PartnerAccounts,OU=Partner,DC=domain,DC=net