counterfeiters?

It looks like the half mark is off by a notch or two... wonder if this is a legit mistake or if it's some kind of Paper Street situation?

Like, obviously you can't copyright length measurement, so maybe they made a small visual goof that (ideally) shouldn't affect any accuracy in order to make their tape design unique? A lot of map makers do the same thing in order to prove if someone copied their map by adding a street that doesn't exist in an area that won't cause issues.