VISA Status Changes

I applied for a B1/B2 visa to attend a scientific conference. During the interview consular said, he’s approving my VISA off now, and if he needs anything additional they will contact me.

I got an email to provide them with a few more documents which I sent on the same day. The status was showing Refused online since after the interview. After I provided the documents it changed to Administrative Processing (18th of July) and stayed the same for a day and the very next day again changed to Refused (19th of July).

Is there anyone who has had the same experience or has an idea of what’s really going on with the application? Seems frustration.