Hey PointHope,

It's kind of hard to say exactly without more details on your network configuration, but my best guess is your wifi/wired networks are on different subnets.

If you can log into your router and take a look at the DHCP server configuration, confirm that both the LAN and Wifi address pools are set to the same subnet (example: 192.168.1.0/24)

Also, maybe give us some more information on your router? Brand, Model, etc..