Re: And this ladies and gentlemen...
Definitely this, but not just non-qwerty (alphabetical is arguably fine for most people), but some machines have *vertical* layouts with ~4 columns of 10 rows, with one column being for numbers.
There is no staggering of spacing or any differentiation between numbers & characters e.g. this
https://www.userfocus.co.uk/images/Car-park-machine-at-Buxton.jpg
I've had a ticket issued & refunded in the UK for this 0/O reason and am well aware of which is which on my car, but mistyped as result of a wacky keypad layout.