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With this in mine always confirm event.stateful when troubleshooting state inconsistencies.
Poller/
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Primary State Mismatch
If state has been lost between the poller and master Primary servers check to see if a correlation rule has fired suppressing the more specific event.
If the issue is not related to a correlation rule look for the corresponding event on the poller. In the event context check the 'Actions taken for event' section. Was a script executed that would have sent the event to the masterPrimary? Was it successful, what was the exit code?