Couchbase incorrect update count returned

INSERT INTO SmallA (IntKey, StringKey) VALUES (100, '100'),(101, '101'),(102, '102'),(103, '103')

update row count is 1 even though all 4 rows are inserted correctly into database.

DELETE FROM SmallA WHERE StringKey=101;

returned 'deleted number of rows' is 0, though the row was deleted from database.