So I upgraded from El Capitan to Sierra and everything seemed okay, however when I used Chrome, Discord, etc. I noticed these slight white bars that seem to appear some parts of the page. It doesn't just happen on Chrome, it happens on most programs that use the internet. Also, when I click and drag stuff, like for example, scrolling though a YouTube video, the cursor goes from the hand to the normal mouse. What is wrong with my Mac, is there some sort of virus I have or has something messed up my mac?