Very similar thing happened with my application where I was "taken in for questioning" twice, but listed them as arrests, since one would have been a felony at that time in the 1970s except the charges were completely dropped or not filed after having "booked/fingerprinted" me etc but then they called my parents to come pick me up, since I was a mere back seat passenger in a car which driven by a criminal (freind of an ex-girlfreind's whom I didn't know, but she got us a ride home from him that time.) I listed the incidents on my application, and was required to get a certified "letter of NO records" letter from the District Clerk .... who then listed no records for those years, but listed another person with the same first and last name as mine on another charge, which was not me, but the Clerk informed the DPS that they'd need to send my fingerprints to the sherrif dept in that county to verify it wasn't me since they had no middle name on that court case ..... eventually, I got my plastic without a hearing too.
Funny thing though, the first denial letter I got said some arrest in a state I had never been to, and that's when I called the DPS and they looked in my file and said that's their mistake, they don;t have anything about be in that State, disregard that deinal letter, then, the next day, I got another denial letter due to the "non-arrests" I listed as "possible arrests, with explanations" on my application.