Problems with DS3234, is damaged?

Hello,
I've two DS3234 connected to two different Arduinos, I followed this tutorial http://www.l8ter.com/?p=375 one of them works perfectly but the other show me the following in Serial monitor:

10/10/10 10:10:0
11/11/11 11:11:11
12/12/12 12:12:12
13/13/13 13:13:13
14/14/14 14:14:14
15/15/15 15:15:15
16/16/16 16:16:16
17/17/17 17:17:17
18/18/18 18:18:18
19/19/19 19:19:19
20/0/20 20:20:20
21/1/21 21:21:21
22/2/22 22:22:22
23/3/23 23:23:23
24/4/24 24:24:24
25/5/25 25:25:25
26/6/26 26:26:26
27/7/27 27:27:27
28/8/28 28:28:28
29/9/29 29:29:29
30/10/30 3:30:30
31/11/31 4:31:31
32/12/32 5:32:32
33/13/33 6:33:33
34/14/34 7:34:34
35/15/35 8:35:35
36/16/36 9:36:36
37/17/37 10:37:37
38/18/38 11:38:38
39/19/39 12:39:39
0/0/40 0:40:40
1/1/41 1:41:41
2/2/42 2:42:42
3/3/43 3:43:43
4/4/44 4:44:44
5/5/45 5:45:45
6/6/46 6:46:46

It seems that every second increase all records in one unit, if I only read every 5 seconds they increased 5 units.
Could it be a wiring or soldering problem or is the DS3234 damaged?

Best regards.

some help???