DHCP ACK sent before DHCP REQUEST, why is this happening?

This is happening infrequently but is happening !!

Note here [from the time] the ACK is being sent before REQUEST

Can someone explain this?

2018-03-31T03:48:21.553144+05:30 spare_ap1.pune.cdac.in <00: 11:74:88:91:5F><134>Jan 9 15:55:30 wl_event_handler: [18:A6:F7:F1:83:88]=>[cdac(00:11:74:88:91:40)] DHCP ACK sent to Client from [10.208.38.1]#012a:fea7] 2018-03-31T03:48:21.553157+05:30 spare_ap1.pune.cdac.in <00: 11:74:88:91:5F><134>Jan 9 15:55:30 wl_event_handler: [18:A6:F7:F1:83:88]=>[cdac(00:11:74:88:91:40)] Client sent DHCP REQUEST#012rom [10.208.38.1]