Explain please.
Like if you did not mash the exactly right pixel
Calibration error. The touch screen is reporting touch coordinates that are offset from screen coordinates where the touch occurred. Assuming the origin is at the upper left, the touch screen is reporting the correct x coordinate, but a too-high (i.e., further down) y coordinate, causing the program to think that the Democrat box had been touched.
Old-fashioned touch screens came with a calibration utility. When you ran it, it put a target on blank screen. You touched the target, and it moved somewhere else, you touched again, etc., until the screen was adequately covered. The utility used the resulting raw data to build a correction table, which it saved in a file, to be read by the touch driver and used to correct the raw coordinates before passing them to the application.
Modern touch screens do not have the problem. You don't calibrate your phone, yet, with a little practice, you can type on its tiny soft keyboard with few errors.
These voting machines are using obsolete touch technology, giving incompetent or evil poll workers an opportunity to mess up the election.