Well, of course I did. I used a keyboard for many years before my formal middle school typing class and by then it was too late. My brain already knew better and typing exercises did no good because I already knew how to use the keyboard without looking.
I imagine this is the dominant case.
If you want to fix it, I recommend simply learning a sensible layout for touch typing.
You also would not have needed such a class if the keyboard was laid out in Dvorak for everybody. You wouldn't need formal training that largely only works if it is drilled into you before natural exposure to a keyboard, because your hands would just do the right thing automatically. The idea of needing a typing class would become entirely absurd; there would be no technique to teach anyone that they wouldn't simply pick up.