Good question. Let's list in one place the ways we explain what the heartbeat alert does. It's the alert that automatically gets selected when you don't pick any alerts and just want to filter the universe. It works to simply inform you what stocks meet the filter conditions you set.
So the reason you receive more alerts with your filters and the heartbeat alert is because its finding all the stocks that meet the filter conditions only.
Once you add an alert other than the heartbeat (i.e., New 30 day High) it limits the stocks that meet the filter further by having to trigger the 30 day High alert.
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