Impact Services Reading Same Alarm Multiple Times

Dear All,
I have Netcool Impact 6.1.1 in our environment which is integrated with Servicenow for automatic ticketing purpose.
Some how the Impact policy is reading the alarm multiple times and this is happening once in a while.
Single Alarm is being read by Impact service multiple times where the Serial number is same for the action taken by Impact policy. This is creating multiple tickets for one alarm.
Why would Impact read the same alarm again? ImpactFlag was set to 1 once the Impact service created the ticket in Servicenow and as far as I understand that Impact service would not read that alarm again as the ImpactFlag was set to 1.

Any suggestions or idea will be appreciated.


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