Disappearing sections of posts

In case anyone is wondering, the reason my posts are sometimes missing lines and whatnot is because I made the font bigger. It seems that if I am allowed to make the font bigger it shouldn't be a problem, but it still gets messed up with every post. However, the font I chose is incredibly small if I use the normal size. I have been trying to figure this problem out for quite some time and I just tried making the last post font size smaller and it was all entirely there, but so small it was annoying to try to read. Alas, I will stay with the bigger font. FYI- if you highlight the entire post all of it will be readable. Maybe I should just pick a new font that isn't so troublesome?