bucket item count shows zero even though documents exist

bucket item count shows zero but if I click bucket's documents, I can find at least hundreds of them. (Will attach screenshot)

Poonam helped with some initial triage and ran

http://172.23.96.117:8091/pools/default?uuid=17866e0fc2f63d07abb37390aa2c9857&waitChange=0&etag=109197025&_=1448497054524

which showed curr_items being zero. I attached one text file for it as "ns_server_response".

Poonam thinks likely memcached reported funny numbers.

Not sure if the following info helps point to any useful direction:

On my (Jenkins/perfrunner) side, this only happens on the Hera cluster (which has a client using old python client library). One funny thing I do is exporting two environment variable in /etc/init.d/couchbase-server of the INDEXER (not on KVs) node and I restart the couchbase-server service on INDEXER (not KVs) node a few times. I also do

curl -X POST -u Administrator:password http://172.23.96.123:8091/internalSettings -d gotraceback=crash

However, this entire recipe is done on the Hades cluster and that cluster does not have this bug.