Pimoroni IPS LCD shows a faint red letter E

I purchased a Pimoroni 8" IPS LCD screen and put it together to test. When I’m able to get the screen to work (oddly, does not work when the ribbon cable is laid flat), I see a faint red letter “E” on the screen. Does anyone know how to fix this or is my screen/board broken? Thanks.

I would very carefully reseat and relock the ribbon cable(s).