After 221g I submitted required document ,after approval email submitted passport for stamping but return passport

Hello Folks,
H-1b visa
I went Visa stamping interview in Mumbai on 21 June 2018 at that time they give 221g for asking additional documents send in email.

After one week I submitted all required documents in email on second day I received email from Mumbai administration for approval and asked for submitting passport. In a week I submitted my passport.

After 10 days my passport return without stamping and give me green 221 g Letter and also one white letters in that my case send back to Kentucky service centre for additional processing.

I need help. Is it denial or I need to wait

Or what i and my employer need to steps for next.