When clicking on pages that aren't unlocked and then on another page that is, they will be displayed as unlocked. I believe the issue here is that the player shouldn't even be able to click on pages that aren't unlocked.
Here is an explanation with images:

1. Now I'm on the first page. As you can see, everything below it is locked
   
2. However, I can click on the second page, of course, with no quests being there.
   
3. And then when I go back to the first page, the second one displays as unlocked
   
4. When I reopen the book, it's back to normal
   

Fudge cakes. Seems I broke buttons and the "disabled" ones still work. You can even open locked quests you shouldn't be able to access among other things. I'll try and get a fix out ASAP