Getting None value in timestamp along with Datetime value in timestamp field

[Tamilraj28]

In raw data, timestamp field value is 1606730113962778 but for the timestamp field in the interesting fields list i am getting two values which are none and 606730113962778. Below are the props configuration

Because of that _time is not properly getting configured.

[Sourcetype]

INDEXED_EXTACTION =json

NO_BINARY_CHECK = true

TIMESTAMP_FIELDS= timestamp

TIME_FOMAT=%s%6N

pulldown_type=1