I had something similar a few years ago. It happened after an iOS update, all of a sudden, my typing was full of errors. It might have been with iOS 12 or 13, but I’m just guessing now, it’s been a while. I just remember having to be super precise when typing. Before, I could be off by a millimeter or two, and the key or autocorrect would still figure out what I meant. But with the new iOS, the touch sensitivity changed, and I had to adjust the way I typed on my iPhone.