I was opening the browser on my iPhone, and a cached image of one of my previous browsing sections occupied the whole screen for a couple of seconds before fading into my actual session. Of course this ghost image happened to be one I did not want anyone looking over my shoulder to see. Luckily no one was around at the time, but now I'm paranoid. I've noticed this several times and it seems my iPhone is intent on only ghosting the most inappropriate private mode screenshots. What gives?