B1/B2 visa approved but still pending administrative review

Yaser

Registered Users (C)
I applied for B1/B2 10 days ago and my application was refused.

I applied again this morning and the VO told me that he approved the visa and that I have to undergo some administrative review which would last for at least 2 weeks.

What did he mean by administrative review? And what would they do it although I got my last visa only 2 years ago without undergoing this step?
 
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