I have purchased several guns and hold my HCP here in TN.
My last purchase I was denied, turns out it was due to a security clearance having expired and someone needed to physically look at it.
After faxing the form it took about 20 minutes to get overturned.
It may not be you, someone with a similar name or SSN (if you disclosed yours) may have gotten in trouble. I would not sweat it as of yet.
Keep us posted