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ada4950-1 vocm problem?


i want to use ada4950-1 as an single to differential amplifier with the gain of 1 and output common voltage  at  500mv , i used adr130 to produce the 500mv and connected directly its output to the vocm of ada4950.when i power up the board and just  measure the voltage at the differential outputs , i see the dc voltage at output positive terminal is 493 mv and output  negative terminal is 505mv . it means there is problem . why i see this problem ?is there any way that we can see identical voltage at the output?best regards