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Kafka >> mail # user >> Consume more than  produce

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Consume more than  produce
After a year or so I have Kafka as my streaming layer in my production, I decided it is time to audit, and to test how many events do I lose, if I lose events at all.
I discovered something interesting which I can't explain.
The producer produces less events that the consumer group consumes.
It is not much more, it is about 0.1% more events
I use the Consumer API (not the simple consumer API)
I was thinking I might had rebalancing going on in my system, but it doesn't look like that.
Did anyone see such a behaviour
In order to audit, I calculated for each event the minute it arrived, and assigned this value to the event, I used statsd do to count all events from all my producer cluster, and all consumer group cluster.
I must say that it is not a happening for every minute,
Thanks, Guy