Isometric views not correct scale as orthographic views

Hi all-

I'm teaching this a hand drafting class and was going to use Cad drawings for the handouts. In the isometic view the true lines are not visually correct. When dimensioning in SW, it reports a correct number but when measured physically it is shorter. Looks like it is scaled down. Is there a reason SW does this?

Thanks--

joseph

SolidworksDrawings And Detailing