[windows upgrade] curr_items_tot & vb_replica_curr_items mismatch for windows offline upgrade 2.0.0->2.1.0

http://qa.hq.northscale.net/job/windows-64-2.0-upgrade/57/consoleFull

i see 3 tests with the same failure

one of them:
./testrunner -i /tmp/upgrade_win.ini get-logs=False,upgrade_version=2.1.0-708-rel,initial_vbuckets=64,GROUP=WINDOWS,EXCLUDE_GROUP=OLD_RELEASE,get-cbcollect-info=True -t newupgradetests.MultiNodesUpgradeTests.offline_cluster_upgrade,initial_version=2.0.0-1976-rel,nodes_init=3,ddocs-num=3,GROUP=2_0;P1,OFFLINE;WINDOWS

steps:
1.3 nodes 2.0.0-1976-rel in cluster
10.3.121.53
10.3.121.89
10.3.121.141
2. default bucket with 1000 items
3.stop all nodes and upgrade on 2.1.0-708

result:
after upgrade
[2013-06-07 18:01:41,995] - [task:388] WARNING - Not Ready: curr_items_tot 1839 == 2000 expected on '10.3.121.53:8091''10.3.121.89:8091''10.3.121.141:8091', default bucket
[2013-06-07 18:01:47,048] - [task:388] WARNING - Not Ready: vb_replica_curr_items 839 == 1000 expected on '10.3.121.53:8091''10.3.121.89:8091''10.3.121.141:8091', default bucket
[2013-06-07 18:01:47,087] - [task:388] WARNING - Not Ready: curr_items_tot 1839 == 2000 expected on '10.3.121.53:8091''10.3.121.89:8091''10.3.121.141:8091', default bucket
[2013-06-07 18:01:52,145] - [task:388] WARNING - Not Ready: vb_replica_curr_items 839 == 1000 expected on '10.3.121.53:8091''10.3.121.89:8091''10.3.121.141:8091', default bucket
[2013-06-07 18:01:52,182] - [task:388] WARNING - Not Ready: curr_items_tot 1839 == 2000 expected on '10.3.121.53:8091''10.3.121.89:8091''10.3.121.141:8091', default bucket