Biblioseph is correct, when you go on view all they are ordered automatically by last updated!

As to the selection on the profile, I'm not sure but maybe Nadia can weigh in!

As far as I can tell, when I navigate to my CR page, the books are ordered from most recently updated to... not recently updated. I also see that on the "find books"/homepage, I see the most recently updated CR at the top of the list. Yet on my profile page I am having difficulty determining why certain books are visible and others aren't. I'd be interested in having the view on the profile be random though, rather than static when I can't even tell why those four are visible. It doesn't seem to be alphabetical or by recent updates.