Why is Safari on iOS 10 not rendering some pages correctly? iPad mini 4
iOS 10.0.1

On several websites when the page loads, Safari is not rendering the page correctly.  Content appears, but images, formatting, colors, etc are missing.

It certainly looks like CSS are being ignored.  If I close the tab, I usually can try the page again and it will render properly.  

There is no discernible pattern to reproduce the problem
It's happening to me as well after installing ios10 on my iPhone 6.  It randomly stops loading pages correctly.   The only way to fix it is to double tap the home button and close down safari or view it private mode.   But it's a temporary fix.