Have you taken the real MBTI or just online versions? The reason it might be different is because on the real test, you can get an X for one of the letters, meaning you're perfectly even between the two, but a lot of online tests don't take that into account. You might just want to go through the types you've gotten on this site (http://www.personalitypage.com/html/high-level.html) and see if you can figure out which one fits you best (this (http://www.personalitypage.com/html/four-prefs.html) might help as well, as personally, ISTJ doesn't sound completely like me, but the letters all fit me). I have an idea which one you might be, but I dunno you in real life, so it's a bit harder to judge certain letters.

I also got Lawfully Evil, but I dunno what the hell that means?