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My IEC61850 IED not responding to ARP request

Hi, I have SEL451IED (IEC61850 server) which is connected in a network. Network has 2 other devices, one Dell PC (IEC61850 Client) and a Kalkitech SYNC (IEC61850 Client) device. IP address of the devices are SEL451-, DELL PC-, Kalkitech SYNC-

Kalkitech SYNC sends an ARP request "215 2019-06-08 02:03:40.791639 KalkiCom_00:cf:4a Broadcast ARP 60 Who has Tell", and SEL451 does not respond to the request.

When DELL PC sends an ARP request then SEL451 replies back as "234 2019-06-08 02:03:43.325118 Schweitz_00:38:ba Dell_b4:0d:18 ARP 60 is at 00:30:a7:00:38:ba"

Wireshark packet captured during this condition is available in this link : .

Is there any error in the ARP request send by Kalkitech SYNC ? Can you help?