Pro Has No Adjustment for the the HOME Position?

[cliffyk]

OP and others, there is nothing wrong with your machines.

There are two Z-axis "zero" positions:

• a "physical zero" position determined by feedback to the firmware from from the optical limit switch  at the base of the Z-axis column;
  
• a "logical zero", an offset from the physical zero, set by relocating the trolley from the physical zero and pressing the "Z=0" button.
  

Pressing the "Home" button always moves the trolley to "physical zero", however a gcode positioning command calling for positioning the trolley to "0" will move the trolley to the logical zero position.

Moviement to the "logical zero" (as saved by thr "Z=0" function) can only be achieved via gcode commands.

More about this in my post here...