I think this means that those alerts are still active, meaning the rule is checking and the error state is still active. This could be due to an old rule that has been deleted for example or just old data.
When you click on these alerts, are they still reporting correctly? You can mute the individual alerts if there is nothing to do about the situation.
If the alerts are "orphaned" then you might need to manually delete the alert documents, see the steps for that here.
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