Alerta transport not deduplicate the same alert

We have Alerta transport that transfer librenms alerts into alerta. Repeating alerts sometime deduplicated but sometime it generate different alert with different event description.

In which, ‘SNMP poll Failure’ is the alert title of the template that the rule attached to. It is the expected mapping. But occasionally, the second records generated on repeating alert, event changed to ‘SNMP Failure’ which is the rule name. Seems the same transport mapping alert fields differently. Any body encounter the similar issue?
Thanks

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