This happens occasionally in Freecell as I've mentioned. Here's a screenshot of a game won around 21:40:50 CDT. https://greenfelt.net/freecell?game=729704587
Again today, won Freecell & don't show up on the scoreboard after the win. 16:49 or so CDT. https://greenfelt.net/freecell?game=1405241045
Think I know what's happening. I must somehow be hitting Give Up. That reproduces these symptoms.
That is entirely possible. Once you've "given up" then the score is submitted for that game—you can continue playing but nothing you do past then counts.
New data point. Just won this game ( https://greenfelt.net/freecell?game=836755792 ) and the screenshot shows the resulting marquee. I'm not present and the total number of plays to date isn't shown. This time I definitely did not hit Give Up.
Another: Just won https://greenfelt.net/freecell?game=1671003657 and here's the screenshot: I'm not listed and the total plays is missing.
This is exactly what I see if I hit "Undo" before starting game. See my post "Game score not added to leader board after undo"