rebalancetests.IncrementalRebalanceInTests.test_load - replication was completed but sum(curr_items) don't match the curr_items_total

Build:2.0.0-1293-rel
http://qa.hq.northscale.net/job/centos-64-2.0rebalance-tests/157/

there are 2 failed tests for job centos-64-2.0rebalance-tests with the same errors:
Traceback (most recent call last):
File "pytests/rebalancetests.py", line 504, in test_load
self._common_test_body()
File "pytests/rebalancetests.py", line 499, in _common_test_body
self)
File "pytests/rebalancetests.py", line 395, in do_kv_and_replica_verification
RebalanceBaseTest.replication_verification(master, bucket_data, replica, self)
File "pytests/rebalancetests.py", line 132, in replication_verification
test.assertTrue(len(asserts) == 0, msg=asserts)
AssertionError: u'replication was completed but sum(curr_items) dont match the curr_items_total bucket-0', 'curr_items : 36194 is not equal to actual # of keys inserted : 36000 : bucket: bucket-0'