I've been setting up alerts for changes made in the Domain Admin group and everything is going well - I have rules to send emails immediately, filters to view in the Monitor section real-time, and nDepth sending daily reports about it. What I noticed is that it's only picking up changes made on either the primary Domain Controller, or just 1 of our secondary DCs. The rules are not picking up changes made on the other secondary DCs we have.
The LEM agents are installed on all DCs and they all seem to have the same Connectors applied. I did inherit this setup so I did not install the agents or set this up myself, but going through guides and THWACK I'm not able to figure this out.