I too have the same problem. I followed the suggested steps above (deactivated all non-Yoast plugins, and then switch to theme Twenty Sixteen. Not only did the highlighted areas appear when using Twenty Sixteen, but I also received different data results.
Theme Twenty Sixteen indicated I had 7.8% of sentences with a transition, but Divi indicated I had 27% of my sentences with a transition! I’m pretty sure the problem lies on Divi’s side.
