ADC pushed to two agents

[Vince-0]

Hi forum!
Is it normal behavior to have an ADC status lead pushed to two agents at the same time even though it appears only once in the active lists. I'm not sure this is even a problem but I can't explain the lead log:

Lead report:
CALLS TO THIS LEAD:
# DATE/TIME LENGTH STATUS TSR CAMPAIGN LIST LEAD HANGUP REASON PHONE
1 2012-06-13 09:38:00 116 NI AGNT1 CAMP1 45000 7438846 AGENT 82YYYYYY
2 2012-06-13 09:36:57 1 DC AGNT1 CAMP1 45000 7438846 AGENT 62XXXXXXXXX
3 2012-06-13 09:36:56 0 ADC VDAD CAMP1 45000 7438846 NONE 62XXXXXXXXX
4 2012-06-13 09:36:45 5 A AGNT2 CAMP1 45000 7438846 AGENT 62XXXXXXXXX
5 2012-06-13 09:36:44 0 ADC VDAD CAMP1 45000 7438846 NONE 62XXXXXXXXX

AGENT LOG RECORDS FOR THIS LEAD:
# DATE/TIME CAMPAIGN TSR PAUSE WAIT TALK DISPO STATUS GROUP SUB
1 2012-06-13 09:37:59 CAMP1 AGNT1 0 1 116 3 NI AGENTS ANDIAL
2 2012-06-13 09:36:46 CAMP1 AGNT1 10 1 1 61 ALTNUM AGENTS
3 2012-06-13 09:36:42 CAMP1 AGNT2 2 1 5 3 A AGENTS

Campaign settings:
DIAL LEVEL: 1.3
FILTER: NONE
DIAL METHOD: RATIO
STATUSES: N, ERI, DROP, DC, B, A, NEW
ORDER: DOWN COUNT
Next Agent Call: random
Call Count Limit: 3
Call Count Target: 7
No list mix or list filter.

System status ADC has only "unworkable" set to Y as per default.
If this is normal behavior, can I make sure the same lead doesn't get pushed to two agents at the same time?

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VERSION: 2.6-365a BUILD: 120420-1620
Multi-server: 1x DB, 1x Web, 4x Dialers
G729
VoIP
OpenSuse - Vicibox Redux 3.1.5

[mcargile]

Do you have auto alt number dialing enabled?

[Vince-0]

Alt number dialing is enabled and Auto Alt-Number Dialing is set to ALT_ONLY. I have noticed the issue is always on the same list.