I'm away from my office for a few days and I'll check when I get back but at one point I unchecked absolutely every option, including one that is called "Automatically reformat when completing code"
By the way, a google search shows quite a few people reporting this issue.
I posted my example in reddit after finding several mentions of the issue there.
https://www.reddit.com/r/Xcode/comments/1dvnhn1 how_to_disable_automatic_indentation_for_code/