Eg4 battery to battery communication

Just added another EG4 LL battery to my server rack giving me total of 400 amp hours. Connected the new ll battery to the 6000xp as the master battery. The 6000 xp inverter will display 100 amp hour when connected to the new LL battery. The inverter will not add the other 300 amp hour batteries to the inverter. Disconnect the new battery as the master and reconnected the old LL battery that was the master. Once the old battery setup was complete, the 6000 xp inverter displayed 300 amp hours 3 batteries connected together. I reconnected the old setup after several fail attempts to set amp hour capacity thru the local connect dongle. All batteries were at 100 percent when connected together. The discharge percentages get way off the more the batteries discharge making it difficult to maintain a balanced system. I do not know why the new battery does not want to talk to  the other 3.