Well a small mistake there but author proly doesnt care about it and focuses more of mc's growth rather than where it came from he just typed it there and mc's like this have some pride you know with them having a system they get excited or get ego inflated and think its theirs(well most system novels) or a mistake from the author. Small details like are usually ignored rather than making a deal out of it since its ok to have some small mistakes that and there but what we must focus is the big mistakes unless we are all blind as sht and ignore it