Created topic by 2 partitions, only can use the one partition

Hi, Guys
It is very weird, I created a topic with 2 partitions couple weeks ago, and
I can only production the message to partition 0, not partition 1, but for
now, I created a new topic again with 2 partitions, it does work.
So whats problem of the old topic? I tried to describe the old topic, I
found the following message

Topic: xxxx Partition: 0 Leader: 1 Replicas: 1
Isr: 1
Topic: xxxx Partition: 1 Leader: 2 Replicas: 2
Isr: 2

Please let me know, if the topic is screwed up.

Thank you