That's definitely a defect, mine doesn't look like that at all. That photo does demonstrate something I was talking with a friend about recently. As much as the Joker coats are consistently a dark purple that behaves differently under certain lighting, some appear to be devoid of purple and just about pure black, as the front part of your coat seems to be. My friend's coat is entirely like your front part, very strange, sloppy QC and signs of the rush to get it out for the film release. I'd contact your dealer you got it from about a replacement, you shouldn't have to keep that.