The lan and wifi interfaces may have different IP’s.  On your wired PC browse to the IP of the wireless interface on the pi.  In OpenWrt you can find what IP’s are assigned to which interfaces by going to Network > Interfaces

Verify your access point or wifi router isn't blocking traffic between wifi and lan.  They usually don't out of the box.

If that doesn't work, you've got to give me more details about your setup.