[Gaaks]

Hello everyone, I'm having an issue where some of my books have a really small font size. I have all my books set to 21 font size, and so far the books I've read were at the size I wanted, however, I started reading one book that had a really small font, so I checked the font size and it was the same 21. I started opening my other unread books and noticed some other books have the same issue. So I believe that there is something else messing with the books font size besides the bottom menu.

What other settings could be affecting my font sizes? I want to figure out what it is so I can mess with it and have all my books have the same font size.