All in one board reading 9v instead of 55.8v

This is a follow from programming a set of 4 all in one boards.
1 out of the 4 all in one prototype boards that I have programmed comes up as battery voltage as 9v with each of the 16 cells showing about 0.5v, when swapping out 3 of them come up with 55.8v which is correct, I have checked the “test point voltages” of this all in on board and the TP!,TP2,TP3,TP4 and TP5 all read the right voltage, TP5 come in a 4.096v, as this is the voltage reference chip that I have used.
Has anyone got any ideas as to what is happening, I have reinstalling the software a couple of times without any difference to the all in one board voltages