Plasma cut parts not matching drawing sizes.

Hello I am using a plasma cutter cnc with mach 3 installed when I import a drawing from inkscape into sheetcam the measured dimension of the drawing on the sheetcam page does not match the measurements drawn in inkscape for example a 2" drawn hole with 0" stroke width actually measures about 1.67" when imported and using the measuring tool in sheetcam. I am using 1:1 scale in imperial units on both applications.

Well somehow after a reboot of all three programs inscape,Sheetcam and Mach3. My cut parts are now matching the drawn size. Wish I knew why but however you could consider topic closed. Thanks