Usually, the LCD meters are fed via switcher box, that I don't see on your console, from the few pics so far.
if you look at the 8k brochure emailed to you a while back, you can see this unit on page 6 below the meters.
It maybe hardwired, maybe 1-8 it's stereo A, B, C, D? did you try these buses?
This box also switches the meters between Peak/VU and it looks like your peak hold is on? as the top/overload is illuminated on your meters.

The meters look like they work, but your right, they're listening to a high noise floor.. on the 2 bus, with no music playing, they sit at no reading:

VU mode:
