Kafka not showing log/lag size even though there is data in logs

I am using Kafka version 0.8, I have data in Kafka logs and wanted to
replay that so I used the kafka tool to reset consumer offsetsto 0.

Though now when I run the ConsumerOffsetChecker tool does not show me
anything, even though there is data in the logs.

The following is the output from the tool.

ubuntu [ at ] ip-10-191-61-160:/apps/kafka$ bin/kafka-run-class.sh
kafka.tools.ConsumerOffsetChecker --group ingestionconsumers --topic rs1
--zkconnect 10.35.138.202:2181
Group Topic Pid Offset
logSize Lag Owner

ubuntu [ at ] ip-10-191-61-160:/apps/kafka$