This happened to my 950 one time. The ghosting was so bad that I could not easily read the text and in my case paging forward then back had no effect as every subsequent page was horribly ghosted. Don't bother with Sony's worthless CS except as a last effort.

What I did was go to the Home screen, select Settings tab, and select Device Shutdown. After the device shut down, I turned it back on and have had no more issues.

Shutting down the device is equivalent to restarting a PC. The device has to restart when turned back on and hopefully this will clear away the glitch that caused the problem. If this fails try resetting, although Sony's concept of resetting is not intuitive so read the manual.