I've never encountered this problem before, but on one puzzle (25x25 challenging, if it matters), my time was much faster than the leaderboard fastest time, but the "New Fastest Time" popup didn't happen, even though I was logged in. My score was less than the full amount of points (390/400). The lowest time on the graph was 606 seconds, but the leaderboard's lowest time was 962 seconds. I have attached a screenshot of the game-over screen. I also commented on the puzzle itself.
Screenshot (352).png
Screenshot (352).png
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