Hi Micah Kim
Check out the following links:
Not sure if it's possible for you to download the text book or not, but this might help if you can.
When you're looking at the text books in the browser, pages can only load so much before the page needs to refresh itself. That's probably what's happening when the pages not scrolling correctly.
Other students that I've helped in the past by recommending that they download their information because they experienced some of these type issues, said that by downloading the information to their computer, the problem was solved.
Do you want to give it a try and let me know if it helps.