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What interface are you using?
What is the current snapshot?
Is there a chance that the events are arriving out of order (i.e. arriving with a snapshot timestamp > than the event timestamp)?
If you're not sure if the data is coming out of order, you can try running a buffer trace from the interface node. From the adm directory in %pihome64%:
pibufss -trace <PointId>
You can get the Point ID from PI SMT > Point Builder > System tab.
If you can't identify the root cause. please contact our Tech Support. We have an internal tool that can monitor incoming events.