view_merge returning duplicate items after rebalance

My item count is 201600, a query to match all documents is returning 202071 (471 dupes)

I've attached the query causing this with debug info.
http://10.1.2.222:8091/couchBase/default/_design/dev_test_view-17f7858/_view/dev_test_view-17f7858?debug=true&connection_timeout=60000&full_set=true

and here are some dupe records being returned
....

{"id":"admin0154-2008_8_20","key":[2008,8,20],"value":["employee-154-7eab34c","154@couchbase.com"]}

,^M

{"id":"admin0154-2008_8_20","key":[2008,8,20],"value":["employee-154-7eab34c","154@couchbase.com"]}

,^M