B1/B2 visa re stamping, one got done second one refused for additional processing

Our B1/B2 Visa stamping renewal was initiated by my son from US, appointment for document submission was fixed at Visa Application center, Bengaluru. Post document submission one visa was stamped whereas the other was refused and returned unstamped saying needs further processing.

Ok, but what is the question here? Did you get 221g for the one refused? If yes, what is the reason on 221g.

Can Mr. Kumar or some one guide as to what needs to be done now?