2018 Christian Yelich has a D- range in the outfield, apparently because he's listed as playing 185 games in the OF. I assume this is because he moved around in the outfield a lot during games, and his total putouts divided by 185 are making him a much worse fielder than he should be.
Fixing this for him for him and anyone else affected might be a pain, but probably worth doing. Unless this glitch has always been present, but I never noticed it before.