I agree. In addition to the huge profusion of libraries dedicated to LCD displays, which confuses more than help, most of them have poor ducommentation, when they do. Your's was like finding an oasis in the middle of the desert. Too bad there are not many more competent people like you on this forum. I was lucky you still got notifications.
When I saw the diagnosis output, I thought it had been discovered by the diagnosis itself and I didn't check it; you are absolutely right: they were reversed.
Now working 100%, thank you very much!