Following Nintendo identifying a bug in Super Mario Party Jamboree - Nintendo Switch 2 Edition + Jamboree TV last week, an update has now been officially rolled out.
This issue was tied to the game's upload records of rankings, and it's apparently operating as it should once again. Apart from the Switch 2 version, this same update is also available for the original Switch release.
Here are the official patch notes, courtesy of Nintendo's support page. If we find out about anything else going on behind the scene, we'll let you know.

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Latest update: Ver. 2.1.1 (Released August 5, 2025)
Bug Fix
Fixed a bug where, when playing on Nintendo Switch 2 and following certain steps, in online rankings for certain minigames, records are uploaded that haven’t actually been achieved.
The Nintendo Switch 2 Edition of Mario Party Jamboree was originally released towards the end of last month. As previously detailed, it adds mouse mode games, camera games and microphone party games. You can also get an upgrade if you own the original Switch release and have access to the Switch 2.
You learn more about this latest game update for Super Mario Party Jamboree in our review. We had a fun time with it, awarding it an "excellent" nine out of ten stars. Nintendo has also updated Game Builder Garage today.