Bucket cbstats returns partial statistics


I am encountering an issue when I issued ‘cbstats -b bucketname -p password IP:PORT all’ on different nodes/IPs.

The returned result sets are different from different nodes/IPs.
Some node/IP returns ep_, vb_ related information, some node/IP doesn’t. I even see ‘auth_errors: 6’ in the return result set from an IP. And sometimes, I got errors like ‘connection refused’

May I ask whether this is normal? How to resolve this type of errors?