Copy collection's existing data in mongo-kafka connector

Hi everyone.
mogno-kafka source connector copy already existing data into another topic :
e.g.,
my connector configs:
topic prefix: mongo
db: kafkalab
collection: box
copy.existing:true

when my connector is running, it copy my data to the mongo.kafkalab.box
but when my mongo-kafka connector container is not running and I insert data to the collection, next time
I run the mongo-kafka container , it copy new existing collection’s data docs to the mongo.5f55407780a6902e063aa0cf_kafkalab.box kafka topic!

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