I think this is part of normal fluctuation of your rating, and I think this happens very commonly.
* If one assumes that ratings will vary a little with time, then they will fluctuate around a value that is somewhat lower than your peak value, of course.
* Sometimes, while first reaching your peak rating, you may have been especially motivated and been playing especially well. Or you may have had a lucky streak with some successful games in a row because your opponents' playing style happened to suit yours well.
* In some cases, after your rating goes down for some games in such a way, it can rise up even higher than your first peak, for example if one has learned some more about which openings you can successfully use against which kind of strong opposition, or which amount of time and dedication can be necessary to successfully play at some certain rating level.
Does anyone else feel like Online chess has been getting tougher? Ratings deflation, perhaps? I've been feeling that way for a little while -- my peak rating was around 2250, and I don't feel like I've been getting worse, but I've been struggling to hold it over 2100 lately.
I just assumed it was my own perception, and that I really have been not playing as well. However, today I noticed that my 2104 rating is #3135 of 288657, 98.9% percentile. I swear that 6-12 months ago, a 2100 rating was no more than 97th percentile. So perhaps I'm not crazy after all?
Am I misremembering history? What's your experience/impression? If this is really happening, any ideas on why would that be? I've never seen a chess rating system do that.