Some clients continue to request duplicate IP - Why?

[OffstageRoller]

From reading through this forum, I understand this is not a problem and it is noise in the logs. Specifically, I'm referring to log events like this one:

uid lease 10.57.90.130 for client ac:04:0b:6b:12:67 is duplicate on 10.57.90.0/24

I see a bunch of those events, from various different types of clients, in my logs. There's the is duplicate event getting logged, followed by a REQUEST and then an ACK.

uid lease 10.57.90.130 for client ac:04:0b:6b:12:67 is duplicate on 10.57.90.0/24
DHCPREQUEST for 10.57.90.81 from ac:04:0b:6b:12:67 via lagg0.90
DHCPACK on 10.57.90.81 to ac:04:0b:6b:12:67 via lagg0.90

Here's what I don't understand... why is the client (or pfSense) referencing 10.57.90.130 for that client in the is duplicate log message? I have a static DHCP entered for this MAC address, and it should only be offered 10.57.90.81 as the IP address. So why is 10.57.90.130 showing up in my logs?

10.57.90.130 doesn't exist in my DHCP leases. I've restarted DHCPD and rebooted pfSense without seeing things change.

If I remove my static DHCP reservation, the is duplicate log message go away for that device, and the device gets the 10.57.90.130 IP address. But why is the device asking for that IP address? How does it even know that IP address is available within the DHCP dynamic pool?