There are three switches on the top which get hit by the axes so they know when to stop. For me, it looks like the third axis is not touching the switch. The axis is not parallel to the top cover so it touches the top on the left side, bevor the middle part can touch the switch. I don’t know why this happens, but you can try to fix the angle of the axis so that it is parallel to the top. Hope this helps.
Switch marked with an orange circle.