strange ping behavior

["Manu" <traqueur () club-internet fr>]

No.     Time        Source                Destination           Protocol 
Info
      1 0.000000    192.168.10.3          192.168.10.13         ICMP 
Echo (ping) request

Frame 1 (74 bytes on wire, 74 bytes captured)
Ethernet II, Src: a4:ba:db:0e:d2:54 (a4:ba:db:0e:d2:54), Dst: 
00:90:c2:c0:f8:fa (00:90:c2:c0:f8:fa)
Internet Protocol, Src: 192.168.10.3 (192.168.10.3), Dst: 192.168.10.13 
(192.168.10.13)
Internet Control Message Protocol
No.     Time        Source                Destination           Protocol 
Info
      2 0.000093    192.168.10.3          192.168.10.13         ICMP 
Echo (ping) request
Hello

I'm running  wireshark 1.2.6 on a windows2003 server

When I ping another box in my office with ping -n 1 192.168.10.13 instead of 
having one packet, I have everything in double as you can see below:
Any idea  ?


Frame 2 (74 bytes on wire, 74 bytes captured)
Ethernet II, Src: a4:ba:db:0e:d2:54 (a4:ba:db:0e:d2:54), Dst: 
00:90:c2:c0:f8:fa (00:90:c2:c0:f8:fa)
Internet Protocol, Src: 192.168.10.3 (192.168.10.3), Dst: 192.168.10.13 
(192.168.10.13)
Internet Control Message Protocol
No.     Time        Source                Destination           Protocol 
Info
      3 0.001232    192.168.10.13         192.168.10.3          ICMP 
Echo (ping) reply

Frame 3 (74 bytes on wire, 74 bytes captured)
Ethernet II, Src: 00:90:c2:c0:f8:fa (00:90:c2:c0:f8:fa), Dst: 
a4:ba:db:0e:d2:54 (a4:ba:db:0e:d2:54)
Internet Protocol, Src: 192.168.10.13 (192.168.10.13), Dst: 192.168.10.3 
(192.168.10.3)
Internet Control Message Protocol
No.     Time        Source                Destination           Protocol 
Info
      4 0.001245    192.168.10.13         192.168.10.3          ICMP 
Echo (ping) reply

Frame 4 (74 bytes on wire, 74 bytes captured)
Ethernet II, Src: 00:90:c2:c0:f8:fa (00:90:c2:c0:f8:fa), Dst: 
a4:ba:db:0e:d2:54 (a4:ba:db:0e:d2:54)
Internet Protocol, Src: 192.168.10.13 (192.168.10.13), Dst: 192.168.10.3 
(192.168.10.3)
Internet Control Message Protocol


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