Duplicates not the same as originals

When I duplicate a rectangle they are both identical on the software grid.When I cut both out of wood,the duplicate is bigger in size.

Are the two rectangles on different layers? If so, check if you have a kerf offset enabled for one of the layers.

If not, can you upload the .lbrn file for this design?

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You hit the nail right on the head!!!
It was a kerf offset!