Oh damn 😛
It seems that if you set the ‘track left eye, right eye’ etc. in the calibration screen… it sticks to that… ie. even the gaze tracker OUTSIDE the calibration is then tracking only left / right / both eyes (whichever you set).
I think I have at some point in the past set it to my right eye when I was playing around with the calibration.
anyway… mystery solved, eyes are not broken.