I just installed the Blue Smart IP22 30 amp charger. I have it connected to an AGM starter battery. I also have a DC to DC 30 amp charger connected at Starter battery charging 600ah Lithium house bank. I am getting a high voltage alarm on starter battery when shore power charger is on and set to normal mode and 30amps. It chargers normally for a while but voltage creeps up and up. I see over 16 volts going into AGM starter battery and dc to dc is in float. All the settings I see indicate charging should be limited to 14.6 volts. Why is the charger above the 14.6 volt limits?