Library sorting (last read)

[ovillo]

On the library preview on the homepage. I set the sort to "last read" thinking I'd get a most-recent-first list of the books I've been reading. But no, the order was different. Then i though it might mean "last marked as read" (as in finished), but that's not it either. I cannot figure out what it's sorting them by. Same thing on the main library view. Is it a bug or am i misunderstanding "last read"?

Related: missing a "reverse sort order" on the homepage library preview.

This is on both ios and android