I may be wrong about this, but I do not think it is erratic...at least based on what I see in the screenshots. It looks like all of the alarms that are missing the user tags are the ones from the hub probe. I think the user tags are added by the spooler, and the hub can probably post alarms without hitting the spooler. On a robot that is running the hub, I believe the hub performs the job of the spooler, but the alarms from the hub may still bypass the usual spooler logic used with other incoming alarms.