I also starting noticing the image placement issue as soon as I upgraded to using an iPhone 6 running iOS 8. I never saw this issue with iOS 7 on my iPhone 5 or iPad 2.
I can clear the browser cache to get rid of issue for a while but it does come back. It seems to happen to websites that I visit often. It happens on LTE and WiFi. Here are websites it happens on, ESPN.com and Shutterfly.com. Since clearing the browser cache doesn't solve the issue this proved that the problem isn't with the websites themselves.
To test more in depth that this is indeed a iOS 8 bug I didn't update my iPad to iOS 8 immediately. While running iOS 7 all websites loaded perfectly with no image placement issues. As soon as iOS 8.1 was released I decided to update my iPad. As soon as upgraded I started noticing the image placement and image loading problems on my iPad as well. For example, Shutterfly's logo was loading in the body of their website and the image that was supposed to be loading in the body loaded where their logo was supposed to be. Also, some images would half-load or not load at all. When they half load the part that didn't load was black and if the image didn't load at all there was just a white space with the title of the image.
*This is an Safari bug with all iOS 8 versions and not a hardware issue. Apple needs to fix this*
I reported this problem to Apple through this feedback link, https://www.apple.com/feedback/iphone.html