I create book pages and child pages, and lately, the pages have been rearranging for no reason I can fathom. I am not a programmer and have only basic understanding of Drupal, so I am at a loss to understand why the pages that I assign specific weights suddenly appear out of order.

Example:
Book: Space & Time >> Section 3 >> Page 124 (weight -13)
I assign the page order as above, but when I come back the next day, page 124 is behind 118. This has been going on for about 2 weeks, where pages will show up out of order.