When you check out of the grocery store, have you ever seen the touch screen select the wrong food? Have you ever seen a bank ATM select the wrong digit? Does your phone select the wrong digit? You might press the wrong button due to fat fingers, but the phone will select whatever digit you pressed.
It doesn’t happen. Touch screens are well established technology which we use many times every day. Election officials claiming that they have calibration issues with their voting machines defies belief.