To explain you why this can happen: the Slate allows you to draw both on a single sheet of paper as on a notebook of up to 0,3 inch | 0,7 centimeters thick.
If you are seeing marks on the app screen despite not drawing anything, it is possible that you left your pen over the Slate below 0,5 cm | 0,4 inches: so the Slate could "believe" you are using a notepad.
- The front LED becomes white when your Ring is recognized on the Slate and purple when your strokes are recorded in Imagink. The good practice is to adjust the hight of your Ring on your own tool and to calibrate it until you are satisfied with the distance between the tip of your pencil and the paper and the moment your strokes are registered.Please make sure to lift up your drawing tool above 0,3 inch | 0,7 centimeters once you are not drawing on it to avoid any possible overflying strokes.
- If you are using a Ring-enhanced tool, check to make sure that the Ring is properly positioned on your tool. Deviations in Ring position may also cause unwanted marks.