Beginner here. I'm working on a phone case. I made a rectangular path (with filleted corners) to match the dimensions of the phone. (I know I'll  probably need to adjust later) The length is 162mm. I drew the profile coincident with the edge of the path. When I measured the inside length with the Measure tool it showed 162.3mm. Also a similar amount more for the width. 

I've redone everything and still