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HSRP - Duplicate address on Vlan, sourced by mac-address

Hi ,


Network structure

Switch A --- Customer firewall 1
   |                
Switch B  --- Customer firewall2

May be some one can help me.

There was a nagious alert yesterday and on investigation I found the 'Duplicate address x.x.x.x(VIP) on Vlanxxx, sourced by 0006.b19c.c5d9' error
It a HA feed from our switches which is going to customer firewalls.

On further investigation I have found on our switch A the ARP table is not learning the VIP address from this mac-address where as on switch B is learning the VIP address through mac 0006.b10c.c8d9 which is customer sonic firewall which is not a normal behaviour.   

Our switches are Cisco 3560 switch.

Please if you could let me know what causing this.

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