It’s not strange at all. If you actually search for something outside the “bubble” they’ll give it to you. What they’re not giving you is stuff you’ve shown a history of not being interested in that kind of fits your search criteria. So if every time you search for “international affairs” you’ve completely ignored everything relating to Egypt they stop giving it to you.
The fun and value of google for me is getting the information I was actually looking for, not random crap that might or might not be related whether interesting or not. If I’m looking for Egyptian restaurants while I might on a grander scale be interested in what’s going on in Egypt the links I’m primarily hoping for would be Egyptian restaurants within short drive of me. Blind dive searches are only for when I’m EXTREMELY bored, and I haven’t been that bored this century.
That is the insanity, googling "international affairs" should be just that, it shouldn't be focused on that Cuban story you were concentrating on 6 months ago, or avoiding Egypt because they are reading your mind and thinking that no, this guy wants Cuba, when actually, Egypt is the dominate story currently and what triggered your search.
The first week or so that I ran into being locked in by that bubble, I was totally baffled by the whacky personalized links coming up, last night I was looking up "Numbers" a homosexual book from the 1960s to make a post here, the next time I am searching for numbers I doubt that it will have anything to do with that book, or homosexuality, or gay literature.
So if I Google “Big Boobs” expecting to get Bill Clinton and Obama, but end up with a sex site, it’s because Google knows I like voluptuous women more than lying Democrats?