Cassandra CQL: different SELECT results

I am using the latest Cassandra 2.1.0 and have different results for the following queries.

select * from zzz.contact where user_id = 53528c87-0691-46f7-81a1-77173fd8390f 
                         and contact_id = 5ea82764-ce42-45f3-8724-e121c8b7d32e;

      

        
        
        
      

    

returns me one canceled entry, but

select * from zzz.contact where user_id = 53528c87-0691-46f7-81a1-77173fd8390f;

      

        
        
        
      

    

returns 6 other rows besides the row returned by the first SELECT.

Key space / table structure:

CREATE KEYSPACE zzz
WITH replication = { 'class' : 'NetworkTopologyStrategy', 'DC1' : '2' };

CREATE TABLE IF NOT EXISTS contact (
    user_id uuid,
    contact_id uuid,
    approved boolean,
    ignored boolean,
    adding_initiator boolean,
    PRIMARY KEY ( user_id, contact_id )
);

      

        
        
        
      

    

Both instances are in keyspace and UN

d:\Tools\apache-cassandra-2.1.0\bin>nodetool status
Starting NodeTool
Note: Ownership information does not include topology; for complete information, specify a      keyspace
Datacenter: DC1
================
Status=Up/Down|/ State=Normal/Leaving/Joining/Moving
--  Address        Load       Tokens  Owns    Host ID                               Rack
UN  192.168.0.146  135.83 KB  256     51.7%   6d035991-3471-498b-8051-55f99a2fdfed  RAC1
UN  192.168.0.216  3.26 MB    256     48.3%   d82f3a69-c6f8-4237-b50e-d2f370ac644a  RAC1

      

        
        
        
      

    

I have two instances of Cassandra.

Trial command "repair nodetool" - didn't help.

Tried adding ALLOW FILTERING at the end of the queries - it didn't help.

Any help is appreciated.

UPD : here is the query result:

Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation.  All rights reserved.

d:\Tools\apache-cassandra-2.1.0\bin>cqlsh 192.168.0.216
Connected to ClusterZzz at 192.168.0.216:9042.
[cqlsh 5.0.1 | Cassandra 2.1.0 | CQL spec 3.2.0 | Native protocol v3]
Use HELP for help.
cqlsh> select * from zzz.contact where user_id = 53528c87-0691-46f7-81a1-77173fd8390f and contact_id = 5ea82764-ce42-45f3-8724-e121c8b7d32e;

 user_id                              | contact_id                           | adding_initiator | approved | ignored
--------------------------------------+--------------------------------------+------------------+----------+---------
 53528c87-0691-46f7-81a1-77173fd8390f | 5ea82764-ce42-45f3-8724-e121c8b7d32e |            False |     True |   False

(1 rows)

cqlsh> select * from zzz.contact where user_id = 53528c87-0691-46f7-81a1-77173fd8390f;

 user_id                              | contact_id                           | adding_initiator | approved | ignored
--------------------------------------+--------------------------------------+------------------+----------+---------
 53528c87-0691-46f7-81a1-77173fd8390f | 6fc7f6e4-ac48-484e-9660-128476ca5bf9 |            False |    False |   False
 53528c87-0691-46f7-81a1-77173fd8390f | 7a240937-8b28-4424-9772-8c4c8e381432 |            False |    False |   False
 53528c87-0691-46f7-81a1-77173fd8390f | 8e6cb13a-96e7-45af-b9d8-40ea459df996 |            False |    False |   False
 53528c87-0691-46f7-81a1-77173fd8390f | 938af09a-0fe3-4cdd-b02e-cbdfb078335c |            False |     True |   False
 53528c87-0691-46f7-81a1-77173fd8390f | d84d9e7a-e81d-42a2-87b3-f163f7a9a646 |            False |     True |   False
 53528c87-0691-46f7-81a1-77173fd8390f | fd2ec705-1661-4cf8-98ef-46f627a9a382 |            False |    False |   False

(6 rows)

cqlsh>

      

        
        
        
      

    

UPD # 2: It's worth mentioning that my nodes are on windows7 machines. We use Linux in production, so there were no problems like me with Windows nodes.