Lichess puzzle ratings are completely puzzling. For example this

SayChessClassical's Blog • Are Chess Improvers Causing a Lichess Tactic Rating Deflation? •

Bulletin No.61 – lichess, the gift that keeps on giving: Puzzles! - Dorset Chess

Lichess Puzzles are too easy. • page 1/12 • General Chess Discussion •

Lower Rating Request? • page 2/2 • Lichess Feedback •

Mismatch between my puzzle rating and game rating on chess.com - Chess Stack Exchange

Some Puzzling Analysis

Lichess timed puzzles

The vision of Lichess and its founder Thibault Duplessis - ChessBase India

How To Get To 1500 Elo Rating in Chess (Honest Guide!)

The Tactics Ladder, Vol. I, Red Series: 1000 Chess Puzzles, A Chess Tactics Book for Expert Players - 2000 FIDE Level eBook : Justesen, Martin: Kindle Store

Seriously? What is the point is putting 13 moves tactics (26 ply deep) with 3800 rating??? - Chess Forums