I just installed 2 mpp pip 2424 msd running in parallel, I followed the installation instructions to the letter. I ran 2 8 awg wires from my breaker panel to the input side of the units each with a 40 amp breaker, the output from both units is tied together with 8 awg wire to a 40 amp disconnect then to a transfer switch than to my breaker panel. My issue is I show 120 volts on the input side on the display with the breaker to the input side off. I used a multimeter and checked at the input breaker it to shows 120 volts at the outlet of the breaker. I need your help