I have my textbook in a pdf format, and the first time I downloaded it, everything was ok. I saw the entire pages well using Preview. After some time, about 3 weeks, the left side of the pages got cut off. Then a few weeks later, the bottom of the pages are also cut off, I'm unable to scroll down to see them. I tried using other pdf apps and have encountered the same issues. However, I don't have this problem with any of my other textbooks that are also pdf. Does anyone know how to fix this?!