I'm noticing a weird trend in many search results. When I do a search (in a clean incognito/private window), I see site A at #1, then if I go to page 2 and then back to page 1, I see site A ranking #7. I also see a couple of pages ranking #8 and #10 that I didn't see the first time. Obviously, search results could not have truly changed in mere seconds. It seems as though there are two different versions of the page 1 of search results and one is displayed the first time you do a search, and the second version is displayed when you revisit page 1. I'm seeing this for quite a few queries across many different niches. Is anybody else noticing this?