Hi Elias,
I have followed the standard configuration that was working few days ago:
Standard config
$config['auth_mechanism'] = 'ldap';
$config['auth_ldap_server'] = 'ldap.example.com'; // Set server(s), space separated. Prefix with ldaps:// for ssl
$config['auth_ldap_suffix'] = ',ou=People,dc=example,dc=com'; // appended to usernames
$config['auth_ldap_groupbase'] = 'ou=groups,dc=example,dc=com'; // all groups must be inside this
$config['auth_ldap_groups']['admin']['level'] = 10; // set admin group to admin level
$config['auth_ldap_groups']['pfy']['level'] = 5; // set pfy group to global read only level
$config['auth_ldap_groups']['support']['level'] = 1; // set support group as a normal user
Also I used the /opt/librenms/Authentication/LdapAuthorizer.php standard one
https://github.com/librenms/librenms/blob/master/LibreNMS/Authentication/LdapAuthorizer.php
(This second part not 100% sure if needed)
Any further details that may be needed? It is strange. All this happened after fixing my db syncronizing it with librenms.