duplicate uniqueid in the table vicidial_agent_log

[marzo]

Hello,

I have a cluster of Vicidial with:
1. telephony server: Vicibox_v.6.0.x86_64-6.0.3 from .iso | Vicidial 2.12-505a Build150806-134 | Asterisk 1.8.32.3-vici | Sangoma A104E card | No Extra Software After Installation | ProLiant DL360 G7 | Intel(R) Xeon(R) CPU X5650 @ 2.67GHz
2. database server: Vicibox_v.6.0.x86_64-6.0.3 from .iso | Vicidial 2.12-505a Build150806-134 | No Extra Software After Installation | 440BX Desktop Reference Platform | Intel(R) Xeon(R) CPU E5-2680 0 @ 2.70GHz | VMware ESXi 6.0
3. web server: Vicibox_v.6.0.x86_64-6.0.3 from .iso | No Extra Software After Installation | 440BX Desktop Reference Platform | Intel(R) Xeon(R) CPU E5-2680 0 @ 2.70GHz | VMware ESXi 6.0

For some calls, in the vicidial_agent_log I have duplicate uniqueid for the same user. By example:

| agent_log_id | user | server_ip | event_time | lead_id | campaign_id | pause_epoch | pause_sec | wait_epoch | wait_sec | talk_epoch | talk_sec | dispo_epoch | dispo_sec | status | user_group | comments | sub_status | dead_epoch | dead_sec | processed | uniqueid | pause_type |
| 25265 | 28216 | 10.3.10.249 | 2015-11-19 08:37:05 | 13313 | C_CSJ | 1447940225 | 120 | 1447940345 | 211 | 1447940556 | 383 | 1447940939 | 0 | DCMX | G_A_CSJ | NULL | DOC | 1447940932 | 0 | N | 1447940548.90179 | AGENT |
| 25369 | 28216 | 10.3.10.249 | 2015-11-19 08:48:59 | NULL | C_CSJ | 1447940939 | 0 | 1447940939 | 6 | 1447940945 | 0 | 1447940945 | 152 | NULL | G_A_CSJ | NULL | DCMX | NULL | 0 | N | 1447940548.90179 | AGENT |

Besides of that, the value of dispo_sec is not mathematical valid.
Any reason for that ?