Did you check your comments to see what kind of comment was left if any? I wouldn't worry about the rep system. It can be abused simply by someone's personal feelings towards the other members or the other members posts and have absolutely nothing to do with the person's knowledge and information provided. Example: I say I don't like the color red because it reminds me of blood and blood is bad. But in that same post I provide a ton of helpful information on getting a fecal done on a frog. If someone doesn't like my feelings on the color red, they can give me a bad mark. I have received bad marks because someone didn't like my joke.