Need help with distorted text in safari

I thought this was a bug but I ran Norton and it came up clean. I only have this problem while in Safari. I'm getting distortion in the texts and in some pictures. Ive zoomed in and out but this doesnt help. The problem stays with the same lines even when I scroll up and down so I know its not the screen. I'm a new mac owner and I need help. What could this be?