Image not centered

How to explain…

Trying to do the Norton tile thing. I center the image in a box the size of the tile but it does not center the image on the tile when its burned.

I have the job origin in the bottom left. I align the beam to the lower left corner of the tile. I exit Lightburn and re-open the file. I set the origin.

The image starts high on the tile by a few mm. Its centered left and right just a little too high from the bottom.

Is there some kind of offset I need to set or un-set?

TIA

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