I noticed something odd while checking out the new book & food achievements. This doesn't seem like an intentional feature but forgive me if it is. The achievement page will display the item count of whatever pet's "books read"/"foods eaten" page I last viewed. For example, I view my battle pet Zephyrax's pages to see that he's read 2146 books and eaten 88 foods. Then I go to the achievement page and view Book Worm and Gourmand, which display like this:
Then I view my feeder pet, Sveto, who has read 16 books and eaten 1594 foods. Then I reload the achievements page and the numbers display like this:
The tiers I've gotten are still green, the one I'm working on is still red, and the ones after are all grey like normal. Currently on Safari on a Mac, not sure what version it is as it's not mine but it seems updated!