I have escalated this issue to the Dell Technical Support.  They have checked with their lab environment and confirmed the same behavior.  There's no functional issue with the status displayed like this.  Two points they have told me: 1) the number of the replica in Outbound includes the history of the replication.   it will show one extra replica in addition to the configured number of replica set. (in my case, it is 1 (configured) + 1 (extra), so 2 in total) 2) the number of the replica in Inbound indicates the actual number of replica set used for data redundancy function.
GroupManager displays different number of replicas, 2 outbound and 1 inbound.  Is this normal behavior? [IMAGE]
EqualLogic GroupManager displays different number of replicas, 2 outbound and 1 
inbound.