This happens quite rarely. From an unknown reason the configuring process didn't get data from the LDAP server and didn't set proper values in the /etc/phpldapadmin/config.php
script. Somewhere near by line 300 were two important lines generated erroneously:
$servers->setValue('server','base',array('dc=example,dc=com'));
$servers->setValue('login','bind_id','cn=admin,dc=example,dc=com');
These settings uses PhpLDAPAdmin to access LDAP datatase regardless to the login name you've been logged in with. To update these lines helped:
$servers->setValue('server','base',array('dc=barbucha'));
$servers->setValue('login','bind_id','cn=admin,dc=barbucha');