Forum Moderators: Robert Charlton & goodroi
The split results can come up if the search keywords have more than one possible meaning. Google's semantic processing, uncovering user-intent and so on, is coming into its own.
Thank you for mentioning this. I couldn't figure out why I only saw it under a search for a certain word but no other searches that I tried. I see now, the word I was searching for can have totally different meanings. BTW, Google did suggest the correct meaning that I intended to search for and I don't use those personalized serps.
Added: Since I first heard about latent semantic indexing, I've been waiting to see something change!