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’ve never understood those reviews
They don’t want to hurt some dev’s numbers, but they don’t like the game either.
Or they just can’t handle giving the thumbs down. A lot of people like that nowadays. Only likes are allowed.
Sometimes it’s the opposite, bad review but positive message