I didn't want to create a new thread, and my question is similar:

Sorry for the large size, not sure how to make it smaller.
My question is:
Did FIRST make a mistake/typo in this picture? The two gaps labeled 10 inches are clearly not of identical lengths ( i even measured to make sure

). I understand why the "not ok" on the left is not ok, but, given the current numbers, i do not understand why the "ok" on the right is ok.
Thanks!
-duke