Not sure if its a machine problem or vcarve problem. My projects are centered when programed but when printing it seems to like offset to oneside. Also if i am doing such as a rectangle the right side is smaller on the edge. Even on other designs. I also noticed my cut starts more to the left even though I have it sent to go in the middle of the board and yes my job size is right. I dont have a vacuum set up worth anything zo excuse the saw dust I know most of you are professional and have money for everything upfront
My best guess at what is happening - you set the lower left corner of the workpiece as your zero point and the block of wood is smaller than what you have configured in Vcarve.
I guess I have never set the probe block setting on the machine. I just set the XYZ. I was setting it with the probe but still was having problems so I did it manually seemed to work better for me.