Jumping puzzles not crediting monthly
Windy Cave does not count as a puzzle. It is an Exploration Achievement not a Puzzle Achievement.
The trigger location for the credit for some puzzles can be very unexpected. You might have to run around near the entrance to trigger it or there might actually be multiple routes to start and only one counts.
It probably would have been less problematic if the monthly actually required finishing the puzzle. That way they could have just put the trigger location next to the chest.