Thanks for your contribution! The new threshold is now included in the latest version.
If the game fails to connect at startup, it retries every minute. Does restarting the game fix the issue?
Additionally, did you by any chance export the savefile from the HTML5 version after you started seeing histograms?
If you didn't overwrite the Linux savefile with the updated one, connecting from it will create a duplicate user and your "unique contribution" mark will temporarily vanish from the leaderboard until I delete your HTML5-submitted solutions from the server (not a big deal, I just need to be aware of the need to do it).
Re: platforms, itch.io is really the best, so welcome!