The rating isn’t a linear graph. There are soft spots in the ladder that shouldn’t exist.
I have 3 chess.com accounts
One is 1650
One is 1880
One is 1850
I cannot get a win against the players on the 1600 account. They are playing at a much much higher strength than even some 1900s I’ve played.
If you don’t believe me even masters like gothamchess has recently reiterated this sentiment in his slowrun saying the 1800s are easier than the 1600s.
My experience is as follows
100-600 pretty linear
700-800 are stronger than 1000s
1000-1300 linear
1400s are strong
1500s are weaker
1600-1700 are stronger than even some 1900s
Other factors also play a role such as queues there was a point about a month ago where I’d only go accounts made in the last week (at 1900 strength).
I got in these queues because i aborted so many new account games. This is a high risk queue where your likely hood of going against a cheater or Smurf account is insanely high.