it is not a problem it is expected behavior,
you can try to configure the ioGear device to accept DHCP address from the Cisco AP (as WAN interface)
and provide it's own DHCP service to the TI device on the LAN interface
the IOgear need tto do routing and NAT between the two networks
the other option is to configure the Cisco-ioGear connection as wireless bridge,
but wireless bridge between two different vendors can be problematic as vendors implement this protocol differently
you will find many problems with on the fora when mixing vendors