What might be the implications of the following messages in the log?

============================================
Dec  6 15:09:39 firewall dhcpd[29710]: option option-79 (119) larger
than buffer.
Dec  6 15:09:39 firewall dhcpd[29710]: rejecting bogus offer.

Dec  9 12:15:35 firewall dhcpd[29710]: option tftp-server-name (111)
larger than buffer.
Dec  9 12:15:35 firewall dhcpd[29710]: rejecting bogus offer.
============================================

Besides the "bogus offer" entries I'm seeing other things like:
============================================
Dec  5 16:02:11 firewall dhcpd[29710]: IP address 172.28.65.139
answers a ping after sending a release
Dec  5 16:02:11 firewall dhcpd[29710]: Possible release spoof - Not
releasing address 172.28.65.139
Dec  5 23:03:36 firewall dhcpd[29710]: Abandoning IP address
172.28.65.121 for 3600 seconds: pinged before offer
Dec  6 09:09:41 firewall dhcpd[29710]: Abandoning IP address
172.28.65.123 for 3600 seconds: pinged before offer
============================================

Possible network issues? Malicious client? Or?

Thank you,

Chris

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