16Rig only sending first 8 channels to Loopback

Hi all,

I'm trying to live stream performances. I am using all 16 inputs on my 16Rig. For some reason only the first 8 USB channels are going to Loopback and getting received by OBS and TikTok Studio. Any idea why?
In the routing matrix if I have Analog 9 input to USB 9 destination, OBS and TikTok Studio don't hear it at all. But if I change the destination to USB 1 through USB 8, it is received.

Why would analog inputs 9-16 not be received like 1-8 are?

Thanks in advance for any ideas here...