This happens on my ipad 3 running 8.1
My iPad 3 does this also. I always use mine in landscape mode and after opening a tab and closing it the original tab will be blank. Originally I was reloading the page but then I found that if I turned my iPad 90 degrees and back it reloaded on its own. Its definitely a glitch and one that never occurred on ios7. If the next ios update dosen't fix it I'm switching browsers.