221g status clarification

I had my stamping (H1B) in January 2020 at Chennai consulate and was issued 221g blue slip, In March my status changed to “AP” from Refused (date also updated) and on May 6 ,2020 got changed from AP to “Application Received” (date also updated)…

please can anyone say what does it mean ?

Note:

Very next day after the interview my employer had submitted the documents that had been asked in the interview…consulate had acknowledged the documents in the same day…