I'm guessing the confusion is why it displays the measurement in two different places when you measure between the same two places.
The answer is, technically you didn't take the same measurement twice... So, I don't think this is actually a bug, just a function of how the software works. The first time you did it, you measured plane to plane. When you do that you've given no exact reference to where on the planes you want to measure. And fusion is just measuring between the two planes, assuming infinity in all directions. So it just puts the measurement wherever.
The second time however you did plane to line. Thats alot more specific because on the second reference point being the line, you now have lost an entire dimension further constraining the specifics of where you are measuring, and therefore why the measurement gets put in a more specific place.
Hope this helps... If so please accept the solution! If not, please explain your confusion further!
Fusion
