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 don’t seem to have this problem as much. That said, I didn’t on Reddit either. Maybe it is because my feeds are mostly science, weird maps, and things discovered on lemmy.nsfw.