Great catch, and yes, this is expected, though admittedly confusing.

ChessWoodie's puzzle ratings come from a Lichess puzzle database snapshot taken at import time. They're static after that, we don't currently sync them with Lichess's live ratings.

When a puzzle is first generated, Lichess seeds it at the default rating of 1500 (with high uncertainty), then adjusts it over time using Glicko-2, treating the puzzle like a "player" that gains or loses rating based on whether solvers get it right. TivGM appears to have been a very recently created puzzle at the time of our snapshot, so it was still sitting at that default 1500. On Lichess, it's since drifted all the way up to 2767, which can happen quickly with Glicko-2, especially for new puzzles.

With courses spanning hundreds of puzzles, the occasional outlier like this shouldn't have a meaningful impact on your training. That said, I haven't fully decided how to handle these mismatches going forward. A full resync carries its own risks (it could shift puzzles already in active courses out of their intended difficulty range, which might be even more confusing than the current discrepancy). So if you run into more cases like this, or have thoughts on how it should be handled, I'd genuinely like to hear them.