Y axis consistently out by 1/8"

SO im cutting simple square recesses out of HDF panel. My programing is correct, layout is good. But the y axis is always 1/8" (towards the rear of the table) making the back margin short by 1/8" and the bottom margin tall by 1/8". I’ve checked the basics on the machine. everything looks good. Suggestions?

Start in the center.

You can manually calibrate the $100, 101, 102 settings like this:

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