The amps you see is the load of what is currently running. One of my LED lights is under .1, the non LED lights in my old trailer were more like 1 amp per light, the radio doesn't use much either. Try something like the fan, water pump, or furnace, those are all around 3Ah in my unit. If I switch the fridge to battery it's up around 12Ah.
If I turn everything off there is still a slight A reading, the propane detector, radio, little led lights here and there, still use a bit.
The GoPower uses the voltage level to figure the % state of charge. The 85% means the voltage dropped a bit. Voltage level drops when you turn stuff on, usually temporarily. Turn everything off and see if the voltage and % bounce back up. This static state is closer to the real state of the batteries.
It's easier to see what's going on at night when the solar is not producing a charging voltage, ie the 13.6V. The actual battery level should be closer to 12.8v.