Good eye, man! Actually you're kid of right, but I double checked the document and it's correct. Remember that the 13 is alongside the first finger's note–if you're like me and habitually look to the finger of lowest string in the chord for guidance then 14 is the lowest fret (held by middle finger, A string), however the index finger is behind at the 13th… I used to get confused like that ALL THE TIME! HA! Great mind think alike I guess ;)

These days I always try and write my chord diagrams so that the fret number is at the base (AKA top) of the diagram. Just good habits.

Thanks for asking!