it could be a bug due to the number being (2^16)-1, which usually means integer overflow happened.
Wait...HOW did a guy get a 65,535 puzzles rating?
https://www.chess.com/blog/JosephReidNZOfficial/the-chess-roller-coaster He talks about it here.
https://www.chess.com/blog/JosephReidNZOfficial/the-chess-roller-coaster He talks about it here.
Yes, this is true.

GenAries is the highest puzzles rating: 65540
Still insane though