Make contribution for puzzles possible

Hi guys does anyone know how are games played on Lichess incorporated into the puzzles? Is it sorted and posted by a programme? Seems daunting to do it manually.

Anyways, I am suggesting that Lichess users can submit interesting puzzles and allow for people who have tried it to upvote or downvote. In that case, we will have a greater variety of puzzles which could be super interesting.

Also I'm saying this because I think I have gotten 1 or 2 puzzles which were repeated. Is it possible or am I just hallucinating?

@Adamantis Sometimes the puzzles that repeat are different variations of the first one but with similar tactics. Also there is the possibility that the next puzzle didn't load, as this has happened to me before. It restarts you with the puzzle that you just did, though winning or losing it again won't affect your rating.

@MeepMonster Ahh I see I think mine is a case of different variations since I played them on different days.