This is a weird set of SERPs all right, but it's behaving the same way they usually do... refining itself based on user click behavior.
I have a group of <keyword>blog.com blogs. Years ago they were solidly #1 in the SERPs for <keyword>, year after year. Then Google started the periodic SERP shuffle, which would always dump them (and most of the other frequently-updated sites with porn on them) several pages down. (It's my opinion that at least one of the factors in the shuffle is a deliberate porn site penalty to get porn sites off the front page of the SERPs.) Every time this happens, you get bizarre results on the front page, usually including a few ancient pages that date back to the internet's prehistory but haven't been updated since the Clinton years.
But here's the thing. When this happens, my search traffic logs show that people start finding me with two word searches: "<keyword> blog". Yeah, I lose some traffic, but the amount remains substantial. And over a period of weeks, my site starts climbing back up the SERPs, because porn site penalty or no porn site penalty, there's also an adjustment BONUS for sites that get clicked on.
Which means that in a few weeks, my <keyword> blog blogs will be back on their respective front pages ... until the next shuffle, or until Google changes how it does business again.
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