This sounds like the 96 vs 72 dpi issue again.
You may be able to go to the document settings and change from 96 to 72 dpi and then do your edits. But confirm the size in the gfui before cutting.
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Looks like that will work. Thank you
255/72*96=340
Open design, select the maze parts - Inscape will show them being 255mm wide in total. With the aspect ratio locked, change width to 340mm. Done.