LMP7721: LMP7721 non-inverting input is not equal inverting input

Part Number: LMP7721

Tool/software:

hi, Dear PL engineer

one thing need consult associated with LMP7721 as below.

my customer want TI propose a circuit to testing x-ray energy. so I propose below charger amplifier.

my customer then use LMP7721EVM board to evaluate the performance of LMP7721. however, customer find that the non-inverting inoput has ~500mV voltage difference versus inverting input. could you please help to figure out the root cause or double check? thanks.

regards,

Bill