> This is Gorton and the letters are carved into the plastic, so this required some effort!

Having operated an old engraving machine and software I would have assumed it was a lack of effort in line spacing. Some of that old software was very primitive as it was a XYZ engraver which operates like a cnc from an origin point, each line needed an new origin offset you had to specify per-line. That happy mistake is when someone sets the line spacing to the font height.