It used to be about a 40 point gap between 59 and 60 (they lowered this with 3.05? 3.07? somewhere around there). I think they lowered it to try and make them more accessible to people with blue scrip vendor gear, but the fact that it falls out of the pattern does make it odd

UPDATE:
Confirmed the floor for cuprite/morel appraisals as 481 perception (80 MA; 482 perception = 83 MA);

Gathering requirement to 1-shot clear level 56 items is 417, for lv 58 items it's 424.
Lowest possible gathering to 1-shot clear folklore node level 60 1-star items: 645.