Consumer Question

[Bo Sun]

I'v got a problem like this.
1. I use the groupname "GourpA" to consume the kafka topic "topicA" .
several days later , we cannot got the new data from the consumer.
2. Then i use the groupname "groupB" to consume the kafa topic "topicA". in
this new consumer , i got the new data. and  i get the new data from the
old consumer.(groupA) at the same time.
i don't know what's wrong with it.
did i do the wrong things ?
thanks