After automatic bed levelling is finished the software asks to insert calibration card for nozzle height detection. 2 boxes show move-up and move-down and third box shows OK. If I press OK and start printing the nozzle is too high from bed. When I press move-up I have to repeat the operation for 4-5 times till the calibration card slightly oppose to the nozzle. But during printing first layer I hear the specific noise of nozzle too close to the bed. I am confused about the automatic levelling as long it is necessary to use the calibration card and move up or down (manually) the bed. Unfortunately Tiertime did not issue latest instruction about levelling and still use in their manual the old one. Any advice for me?