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Disappearing MAC Addresses

I have a strange issue with 8 new APC ePDUs. Until today, these devices were unable to communicate via IP but I was able to see their MAC addresses in the MAC address table and could verify they were there on VLAN15. Today, a new DHCP server was installed and DHCP reservations were configured for these devices. Now while I'm able to ping these addresses, their mac address disappears from the address-table for a period of time before returning. I'm also unable to browse to these devices. What makes it even stranger, other devices on different VLANS on the same switch do not have this issue.

Any ideas on how to solve this puzzling issue?

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