HTTP input sending duplicate events?

Getting Data In

I have configured HTTP inputs by creating HEC token in heavy forwarder.

I see duplicate events every time I test sending data via these HEC token. I have validated that source does not have duplicate events.

Even if I send a test event using curl command, it appears twice.

curl -k https://<endpoint>:8088/services/collector/event -H "Authorization: Splunk <HEC token>” -d '{"event": "This is a test event"}'

Please help find out why are there duplicate events and how can I fix it.

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