My fortress manufactures a lot of quires, and I have several bookcases in the library. However, once they have been read, they are placed on the floor, and marked with "TSK" - presumably to place them on the cases. But, the dwarves never place them on the cases, and the "TSK" remains permanently active. Sometimes, by forbidding & unforbidding each one, I can get a single book to be placed on a bookcase. But, with the large collection of books this has become very impractical.

Basically, the dwarves write a quire, read it once, and never touch it again!!

Steps to reproduce:
1) press F4 (to go to the library level)
2) pan the view left - the library is the last large room on the left
3) press [K] to view the quires, scrolls and codices strewn on the library floor, note the "TSK" is active, but no dorfs appear to be doing anything with the literature