DHCP Assigned IPs

I have a Cisco 2901 router configured with one DHCP pool this is the configuration.

!

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ip dhcp excluded-address 10.0.0.1 10.0.0.20

!

ip dhcp pool MAIN

network 10.0.0.0 255.255.255.0

default-router 10.0.0.3

dns-server 8.8.4.4

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I also have a 1602i AP with a few connected devices that pull DHCP IPs staring at 10.0.0.21 and 10.0.0.22 and so on. The AP it self has a static IP. But my main desktop which is hardwired in to my switch gets a DHCP address of 10.0.0.90, there is another desktop that pulls a DHCP address of 10.0.0.24 along with the other devices. Why would the one be different, both run windows 10 and are on the same vlan. The switch that I am currently using is an unmanaged cisco small business switch.