I have noticed that, too.
Do you think they are using bots?
I suspect that might be the case sometimes........notably when players take a long time to play.
However, I see no way to prove it, so I have kept my thoughts to myself until now.
I keep hoping when I reach 1700, that I, also, will shoot up there, but, it hasn't happened, so far.
I do know it's easy to drop 100-200 rating points, either by a bad luck streak, distractions, or maybe a streak of retardation, speaking for myself, of course.
"In 1949, we stayed with one of my friends who had a book in which people were asked to write down their secret ambitions. Ronald Reagan wrote he'd like to be president. All those years ago!". - Patricia Neal