Fake Money Used to Purchase Classic Car

I stopped at a bank in Ridgeway, VA about 20 years. Walked up to the outside ATM and got $100. I counted it as soon as it was dispensed. One of the $20 bills looked slightly off in color so I went inside the bank and asked to swap it so someone wouldn't think I was trying to pass a counterfeit bill. She looked at it, asked me to wait, showed it to another lady. Lots of whispering going on behind there. One asked the other "So you can clearly see him getting it from the ATM?". The answer was "Yes".
This whole time I started to worry that I may be suspected. But they reviewed the footage from the ATM camera. Then I heard one of them say "We are going to have to review our ATM procedures".
She handed me another $20 and I was on my way. After that, anytime I used an ATM, I would always hold up the money in front of the camera and fan it out so it could been seen clearly before leaving... just in case.