I have setup...

ether1: 192.168.5.26
wlan1: 192.168.5.29

problem is when I ping them they both show the ether1 mac address. I need to pass all mac addresses for our WISP billing and management unit hardware behind the mikrotik. How do I do this?

What is your subnet mask and each interface? If you are wanting to route, the interfaces must be on different networks. If you are wanting to bridge, you will need to setup a bridge between the interfaces and the bridge gets an address.