Harmony 17 Premium and Wacom Bamboo CTH-470 auto-zoom BUG

hello, I’ve a problem with bamboo cth 470 with harmony premium 17, when I start use the pen and come closer to the board I don’t know why harmony autozoom himself.
with other programs it works well,can it be a problem of the driver? I have installed the most recent driver for my bamboo wacom . Do you know if there are some settings inside harmony to change or you think that may be only a problem of the driver? thanks