Hello and welcome to TGO. This happened to me on my last gun purchase, an AK47 at Bud's Gun Store when I thought we were gonna have a different president elected, and I also have my HCP and a very clean record. A couple of days went by and I ran across an AK on Armslist at a good price and bought it. Low and behold about 3 days later Bud's calls and says it has been overturned and I can come pick my gun up. I am a Man of my word so I now have two, lol. I asked the super nice feller at Bud's what the problem was, when I went to pick up my second AK lol, and he said it was probably an error on the clerk entering a number wrong but couldn't tell me for sure and gave me a number to call. I called the number, spoke to a couple of different people but nobody could tell me why I got denied nor why it was overturned. To this day I don't know, and may never know, but if it happens again I will find out and get it cleared up if I have to hire an attorney. Good luck to you.