i could think of three things:
1: maybe you have played royal poker more in 2015 then you are now and switched to hold’em/omaha
2: maybe you have played much less after 2015 and because of the less hands there are also less strong hands.
3: there is indeed something strange happening. i am just like you a stat person instead of conspiracy, and also defendeed the site (which i’ll keep doing). but glitches can and will happen from time to time on any site, and that could maybe a reason this happens. i also have experienced strange stuff, not exactly the same thing as you talk about. but also a “bad luck” related problem. look at this: http://forums.replaypoker.com/t/question-for-replay/5973/30
don’t know if it helps at all, but at least you know you are’nt the only one that trust the site and still experince strange stuff.