I think they mean that the zero points and max positions of each axis is been changed.

I've done something similar. When I cancel my prints the extruder moves to the far left, but then it reached the bar, the stepper motor continues to rotate for another second, even though there is no more space left.
So basically the extruder hits the left side.

I know this occurred because I accidentally clicked make zero in replicatorG when trying to calibrate the axes, but not sure how to fix it.