Weird waitForOffset logging on cache create

[atamon]

We had this logged when one of our internal services started:

[2019-01-11T05:29:32.943Z] DEBUG: kafka-cache/1 on notifications-c75947595-xphpm: Notifying callbacks for offset (nCallbacks=0, offset=281)
[2019-01-11T05:29:35.245Z] DEBUG: kafka-cache/1 on notifications-c75947595-xphpm: Notifying callbacks for offset (nCallbacks=0, offset=11327)
[2019-01-11T05:29:35.446Z] DEBUG: kafka-cache/1 on notifications-c75947595-xphpm: Notifying callbacks for offset (nCallbacks=0, offset=926)

I only expected the second log-message to happen