reduce map show different count number at each node

Install couchbase server 2.0.0r-266 on 3 nodes at ec2.
Use mcsoda to load 200000 items to cluster.
Create a view name one and do some query.
Shutdown one node (A) and failover
Check reduce count on view one. Ok
Reinstall couchbase server 2.0.0r-266 on node A and add it back to cluster.
Rebalance. Ok
Check reduce count on view one. Ok
Shutdown node B and failover.
Check reduce count on cluster. Ok
Reinstall couchbase server 2.0.0r-266 on node B and add it back to cluster.
Rebalance Ok.
Check reduce count on full cluster. Failed
Restart couchbase server on 3 nodes of cluster.
See reduce count is different on each node