I know I’m late to the party but I just found out and didn’t find a post regarding this
TL;DR: Steam now calculates review scores based on reviews made on your languages only (if enough). This is on by default, but can be reverted to go back to review scores based on all reviews (from people that purchased the game directly on Steam only)
I feel like it’s also a way to limit review bombing, like what happened for recent games regarding privacy policy changes
I’m not a fan of it
EDIT: Did you change your comment? I think it wasn’t like this, because my answer doesn’t make sense
…were those reviews from some specific languages?
I believe they often start in english only. This might limit the impact for non-english speakers
https://www.thegamer.com/wuchang-fallen-feathers-review-bomb-censorship-update-changes-patch/
Could be from stuff akin to this. This is the second bombing of Wuchang, first was post-launch due to UE5 spec demands