If I knew the answer as to why, I wouldn't be asking. Stupid question? I don't think so. I believe it may have something to do with the trigger return spring wanting to twist the trigger bar to the right, but I'm not sure. Like I said, it was fine when I installed it. You're initial response rubbed me the wrong way, assuming I don't know what I'm doing. If that wasn't your intent, I apologize. If it was your intent and you have no constructive advice, then I think we're done here .