My battery state of charge display shows a charge drop when a load is draining the batteries..... but when voltage is being applied to the batteries it does show as charging up until I unplug the cord from the shunt and plug back in? Eg.....shows a drop of in charge but doesn’t show an increase in state of charge until the wire from the display to the shunt is unplugged and plugged back in. It has on a couple of occasions shown such a low state of charge that it shuts down the electrical even though the batteries were charged.