Hello, I’m new to 3D printing and I just bought a Creality Ender 3 printer. After assembling and adjusting it, when I turn it on, the home coordinates shown on the screen are not at 0,0,0, I get X = -3, Y = -10 and Z = 0 and when I do autohome, the extruder nozzle stays off the bed. Is this normal or is it a fault and, if so, how do I solve it? Please, could you help me? Thank you very much.